Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Power Engineering Terms > All Terms > Flashcards

All Terms Flashcards

1
Q

ABRASION

A

The wearing away of a surface by rubbing, as with sandpaper on wood.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

ABRASION RESISTANCE

A

The ability of a material to resist surface wear.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

ABRASIVE EROSION

A

Erosive wear caused by the relative motion of solid particles which are entrained in a fluid, moving nearly parallel to a solid surface.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

ABSOLUTE HUMIDITY

A

Amount of moisture in the air, indicated in kg/kg of dry air.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

ABSOLUTE PRESSURE

A

Total pressure measured from an absolute vacuum. It equals the sum of the gauge pressure and the atmospheric pressure corresponding to the barometer.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

ABSOLUTE PRESSURE

A

Air at standard conditions (70°F air at sea level with a barometric pressure of 29.92 in Hg) exerts a pressure of 14.696 psi. This is the pressure in a system when the pressure gauge reads zero. So the absolute pressure of a system is the gauge pressure in pounds per square inch added to the atmospheric pressure of 14.696 psi (use 14.7 psi in environmental system work) and the symbol is “psia”.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

ABSOLUTE TEMPERATURE SCALE

A

A scale of temperature measurement in which zero degrees is absolute zero.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

ABSOLUTE ZERO

A

A hypothetical temperature at which there is total absence of heat. Since heat is a result of energy caused by molecular motion, there is no motion of molecules with

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

ABSOLUTE ZERO TEMPERATURE

A

Temperature measured from absolute zero (

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

ABSORBENT

A

A material which, due to an affinity for certain substances, extracts one or more such substances from a liquid or gaseous medium with which it contacts and which changes physically or chemically, or both, during the process. Calcium chloride is an example of a solid absorbent, while solutions of lithium chloride, lithium bromide, and ethylene glycols are liquid absorbents.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

ABSORBER

A

That part of the low side of an absorption system, used for absorbing vapor refrigerant.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

ABSORPTION

A

A process whereby a material extracts one or more substances present in an atmosphere or mixture of gases or liquids accompanied by the material’s physical and/or chemical changes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

ABSORPTION TOWER

A

A tower or column, which effects contact between a rising gas and a falling liquid, so that part of the gas may be taken up by the liquid.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

ACCELERATION

A

The rate of change of velocity, as a function of time. Expressed in m/s.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

ACCELERATION DUE TO GRAVITY

A

The rate of increase in velocity of a body falling freely in a vacuum. Its value varies with latitude and elevation. The International Standard is 9.81 m/s^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

ACCEPTABLE WELD

A

A weld that meets all of the requirements and the acceptance criteria prescribed by the welding specifications.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

ACCESSIBLE HERMETIC

A

An assembly of motor and compressor, inside a single bolted housing unit.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

ACCUMULATOR

A

Storage tank which receives liquid refrigerant from evaporator and prevents it from flowing into suction line before vaporizing.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

ACETONE

A

A filler added to acetylene cylinders, capable of absorbing 25 times its own volume of acetylene.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

ACID

A

Literally hitter, but chemically the state of a water solution containing a high concentration of hydrogen ions.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

ACID ATTACK

A

Caused by an incomplete flushing after an acid cleaning process of boilers or similar equipment.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

ACID CLEANING

A

The process of cleaning the interior surfaces of steam generating units by filling the unit with dilute acid accompanied by an inhibitor to prevent corrosion and by

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

ACID RAIN

A

Atmospheric precipitation with an pH below 5.6 to 5.7.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

ACID SOAK

A

A method of acid cleaning, in which the acid is pumped into the boiler and rests there for a period of time.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

ACIDIC

A

The reaction of a substance with water resulting in an increase in concentration of hydrogen ions in solution (see acid).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

ACIDIFIED

A

The addition of an acid (usually nitric or sulfuric) to a sample to lower the pH below 2.0. The purpose of the acidification is to “fix” a sample so it will not change until it is

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

ACIDITY

A

Represents the amount of free carbon dioxide, mineral acids, and salts (especially sulfates of iron and aluminum) which hydrolyze to give hydrogen ions in the water. The

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

ACOUSTIC

A

A term pertaining to sound, or the science of sound.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

ACTIVATED CARBON

A

Is a specially processed carbon, used as a filter drier. Commonly used to clean air.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

ACTIVATED SLUDGE

A

An aerobic biological process for conversion of soluble organic matter to solid biomass, removable by gravity or filtration.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

ACTIVE STORAGE PILE

A

A method of stockpiling coal, sometimes called live storage. The pile is located outside the plant but adjacent to it, and usually contains four or five days of

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

ACTUATOR

A

The portion of a regulating valve, which converts mechanical, fluid, thermal, or electrical energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

ADIABATIC

A

Occurring with no addition or loss of heat from the system under consideration.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

ADIABATIC CHANGE

A

A change in the volume, pressure, or temperature of a gas, occurring without a gain of heat or loss of heat.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

ADIABATIC COMPRESSION

A

Compressing a gas without removing or adding heat.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

ADIABATIC COOLING

A

A method in which paramagnetic salts are pre

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

ADIABATIC EFFICIENCY

A

The ratio of actual work output of a heat engine to the ideal output.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

ADIABATIC EXPANSION

A

The expansion of a gas, vapor, or liquid stream from a higher pressure to a lower pressure, with no change in enthalpy.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

ADJUSTABLE RESISTOR

A

A resistor whose value can be mechanically changed, usually by the use of a sliding contact.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

ADSORBENT

A

A material which has the ability to cause molecules of gases, liquids or solids to adhere to its internal surfaces without changing the adsorbent physically or chemically.Adsorption is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface. This process creates a film of the adsorbate on the surface of the adsorbent. This process differs from absorption, in which a fluid is dissolved by or permeates a liquid or solid.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

ADSORPTION

A

A material which has the ability to cause molecules of gases, liquids or solids to adhere to its internal surfaces without changing the adsorbent physically or chemically.Adsorption is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface. This process creates a film of the adsorbate on the surface of the adsorbent. This process differs from absorption, in which a fluid is dissolved by or permeates a liquid or solid.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

ADVECTION

A

The transfer of heat by horizontal movement of air.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

AERATION

A

Exposing to the action of air, like blowing air through water before discharging to a river.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

AEROBIC

A

A condition in which “free” or dissolved oxygen is present in water.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

AERODYNAMIC NOISE

A

Also called generated noise, self

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

generated noise

A

is noise of aerodynamic origin in a moving fluid arising from flow instabilities. In duct systems, aerodynamic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

AGGLOMERATE

A

The clustering together of a few or many particles into a larger solid mass.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

AGITATOR

A

A device used to cause motion in confined fluids.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

AIR

A

A substance containing by volume approximately 79% nitrogen 20.95% oxygen, .94% argon, traces of carbon dioxide, helium, etc.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

AIR CHANGES

A

A method of expressing the amount of air leakage into or out of a building or room in terms of the number of building volumes or room volumes exchanged.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

AIR COIL

A

Coil on some types of heat pumps used either as an evaporator or a condenser.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

AIR CONDITIONER

A

They are basically refrigeration devices cooling air and rooms rather then food compartments.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

AIR CONDITIONER, UNITARY

A

An evaporator, compressor, and condenser combination

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

AIR CONDITIONING

A

The process of treating air to simultaneously control its temperature, humidity, cleanliness, and distribution to meet the requirements of the conditioned space.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
55
Q

AIR CONDITIONING UNIT

A

An assembly of equipment for the treatment of air so as to control, simultaneously, its temperature, humidity, cleanliness and distribution to meet the

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
56
Q

AIR CONDITIONING, COMFORT

A

The process of treating air so as to control simultaneously its temperature, humidity, cleanliness and distribution to meet the comfort requirements

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
57
Q

AIR COOLER

A

A factory

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
58
Q

AIR DIFFUSER

A

A circular, square, or rectangular air distribution outlet, generally located in the ceiling and comprised of deflecting members discharging supply air in various directions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
59
Q

AIR DIFFUSION AERATORS

A

They are aerators into which air is pumped into the water through perforated pipes, plates, or any other method.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
60
Q

AIR DUCT

A

A tube or conduit for conveying air from one place to another.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
61
Q

AIR FLOTATION

A

A process of accelerating sedimentation, by introducing air into the water, this lowers the density of the water, and increases the differences in the densities of the

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
62
Q

AIR GAP

A

The space between magnetic poles, or between the rotating and stationary assemblies in a motor or generator.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
63
Q

AIR HANDLER

A

The fan blower, heat transfer coil, filter, and housing parts, of a system.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
64
Q

AIR PURGE

A

The removal of undesired matter by replacement with air.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
65
Q

AIR SATURATED

A

Moist air in which the partial pressure of the water vapor is equal to the vapor pressure of water at the existing temperature. This occurs when dry air and saturated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
66
Q

AIR VENT

A

Valve, either manual or automatic, to remove air from the highest point of a coil or piping assembly.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
67
Q

AIR, AMBIENT

A

Generally the air surrounding the object.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
68
Q

AIR, DRY

A

Air without contained water vapor.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
69
Q

AIR, OUTDOOR

A

Air taken from outdoors and, therefore, not previously circulated through the system.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
70
Q

AIR, RECIRCULATED

A

Return air passed through the conditioner before being again supplied to the conditioned space.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
71
Q

AIR, REHEATING

A

In an air conditioning system, the final step in treatment, in the event the temperature is too low.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
72
Q

AIR, RETURN

A

Air returned from conditioned or refrigerated space.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
73
Q

AIRBORNE SOUND

A

Sound which reaches the point of interest by radiation through the air.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
74
Q

AIR

A

COOLED CONDENSER

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
75
Q

ALCOHOL BRINE

A

A water and alcohol solution, which remains as a liquid below 0°C.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
76
Q

ALGAE

A

A minute fresh water plant growth which forms a scum on the surfaces of recirculated water apparatus, interfering with fluid flow and heat transfer. Lower form of plant life,

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
77
Q

ALKALI

A

A substance having marked basic properties. Applying to hydroxides of potassium, sodium, lithium, and ammonium. They turn red litmus to blue. Includes hydroxides of the

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
78
Q

ALKALINE

A

Having a pH greater than 7.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
79
Q

ALKALINITY

A

An expression of the total basic anions (hydroxyl groups) present in a solution. It also represents, particularly in water analysis, the bi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
80
Q

ALLEN TYPE SCREW

A

A screw with a recessed hex shaped head.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
81
Q

ALLOY

A

A substance having metal properties and being composed of two or more chemical elements of which at least one is a metal.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
82
Q

ALLOY STEEL

A

Steel containing specific quantities of alloying elements (other than carbon)and commonly accepted amounts of manganese, copper, silicon, sulfur, and phosphorus).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
83
Q

ALTERNATING CURRENT (AC)

A

Electric current in which the direction of the current alternates or reverses. In a 60 Hertz (cycle) current, the direction of current flow reverses in

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
84
Q

ALTERNATOR

A

A device which converts mechanical energy, into alternating current.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
85
Q

ALTIMETER

A

An instrument used to measure the height above a reference point, such as ground or sea level.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
86
Q

ALUM

A

Is an aluminum sulfate or filter alum. Acts in the range of 5.0 to 8.0 pH.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
87
Q

ALUMINA

A

Aluminum oxide occasionally found as an impurity in water in very small amounts.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
88
Q

AMBIENT AIR TEMPERATURE

A

Temperature of fluid (usually air) which surrounds object on all sides.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
89
Q

AMBIENT CONDITIONS

A

The conditions of temperature, pressure, and humidity, existing around an instrument.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
90
Q

AMBIENT NOISE

A

The normal sound in a room or other location.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
91
Q

AMINE

A

A chemical use in water treatment as a filming or neutralizing agent to protect the metal parts.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
92
Q

AMMETER

A

An instrument for measuring the magnitude of electric current flow.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
93
Q

AMMETER SHUNT

A

A low

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
94
Q

AMMONIA

A

Chemical combination of nitrogen and hydrogen (NH3). Ammonia is a very efficient refrigerant and identified as R

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
95
Q

AMORPHOUS

A

A solid not having a repetitive three

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
96
Q

AMPACITY

A

A wire’s ability to carry current safely, without undue heating. The term formerly used to describe this characteristic was current capacity of the wire.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
97
Q

AMPERAGE

A

An electron or current flow of one coulomb per second, past a given point in a circuit.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
98
Q

AMPERE

A

The unit used for measuring the quantity of an electrical current flow. One ampere represent a flow of one coulomb per second.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
99
Q

AMPERE HOUR

A

A term used for rating battery capacity. As stated, an ampere for an hour

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
100
Q

AMPERE TURNS

A

A term used to measure magnetic force. It represents the product of amperes, times the number of turns of the coil, in an electromagnet.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
101
Q

AMPLIFICATION

A

The process of obtaining an output signal greater than the input signal, through auxiliary power controlled by the input signal. The process of increasing the

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
102
Q

AMPLITUDE

A

The maximum instantaneous value of alternating current or voltage. It can be in either a positive or negative direction. The greatest distance through which an oscillating

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
103
Q

ANAEROBIC

A

A condition in which “free” or dissolved oxygen is not present in the water.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
104
Q

ANEMOMETER

A

An instrument for measuring the velocity of a fluid.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
105
Q

ANGLE VALVE

A

A type of globe valve design, having pipe openings at right angles to each other. Usually one opening on the horizontal plane and one on the vertical plane.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
106
Q

ANNEAL

A

To soften by heating and allowing to cool slowly.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
107
Q

ANNEALING

A

A process of heat treating metal, to get the desired properties of softness and ductility, (easy to form).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
108
Q

ANODE

A

In electrolysis or electrochemical corrosion, a site where metal goes into solution as a cation leaving behind an equivalent of electrons to be transferred to the opposite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
109
Q

ANODIZING

A

The treatment of a metal surface whereby the metal is made anodic.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
110
Q

ANSI

A

American National Standard Institute, which is an organization defining standards for computer language.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
111
Q

ANTI KNOCK VALUE

A

A premature explosive combustion, as the detonation of the fuel air mixture in an internal combustion engine, produces a characteristic knock. The Anti Knock

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
112
Q

ANTICIPATING CONTROL

A

One which, by artificial means, is activated sooner than it would be without such means, to produce a smaller differential of the controlled property. Heat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
113
Q

ANTICIPATORS

A

A small heater element in two

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
114
Q

ANTIFOAM AGENTS

A

The reduction of carry over by the addition of polymerized esters, alcohol’s, and amides. The antifoam agent is absorbed on the steam generating surface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
115
Q

ANTIFOULANTS

A

Are materials which prevent fouling from depositing on heat transfer equipment. Materials that prevent deposits forming

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
116
Q

ANTIFREEZE

A

Compounds of glycol’s or alcohol’s, that lower the freezing point of cooling water systems.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
117
Q

ANTIOXIDANT

A

A substance which when added in small amounts to petroleum products, will delay or inhibit undesirable changes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
118
Q

APPARENT (EMF)

A

The apparent voltage, as measured by the drop in pressure due to a current flowing through a resistance.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
119
Q

APPARENT WATTS

A

The product of volts times amperes, in an alternating current circuit.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
120
Q

AQUEOUS

A

Watery. A substance containing water.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
121
Q

AQUIFER

A

A porous, subsurface geological structure carrying or holding water.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
122
Q

ARC

A

A flash, caused by an electric current ionizing a gas or vapor.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
123
Q

ARC BRAZING

A

A brazing process in which the heat required is obtained from an electric arc.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
124
Q

ARC FURNACE

A

An electric furnace, in which heat is produced by an arc between two electrodes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
125
Q

ARC WELDING

A

A group of welding processes which produce coalescence of metals by heating them with an arc, with or without the application of pressure, and with or without the

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
126
Q

ARC WELDING

A

A process where coalescence is obtained by heating with an electric arc.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
127
Q

ARMATURE

A

the rotating part of an electric motor or generator. The moving part of a relay or vibrator.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
128
Q

ARMATURE AIR GAP

A

The air space between the stationary and rotating parts of a motor or generator, through which magnetic lines of force pass.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
129
Q

ARMATURE BACK AMPERE TURNS

A

The magnetic field produced by current flowing in the armature winding, that opposes and reduces the number of magnetic lines of force,

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
130
Q

ARMATURE BAR

A

Copper bars used in place of wire windings, in large armatures, generators, or motors.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
131
Q

ARMATURE CIRCUIT

A

The path that the current takes, in flowing through the windings from one brush to another.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
132
Q

ARMATURE COIL

A

The loop or coil of copper wire, placed on the armature core, and forming part of the winding.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
133
Q

ARMATURE CORE

A

The laminated iron part of the armature, formed from thin sheets or disks of steel, on which the windings are placed.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
134
Q

ARMATURE CURRENT

A

The current flowing from the armature of a generator, to the armature of a motor. Not including the current taken by the shunt field.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
135
Q

ARMATURE DEMAGNETIZATION

A

The reduction in the effective magnetic lines of force, produced by the armature current.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
136
Q

ARMATURE REACTION

A

The effect, that the magnetic field produced by the current flowing in the armature, has on the magnetic field produced by the field coils.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
137
Q

ARMATURE REGULATING RESISTORS

A

Are resistors, designed to regulate the speed or torque of a loaded motor, by placing a resistance in the armature or power circuit.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
138
Q

ARMATURE RESISTANCE

A

The resistance of the wire used in the windings of the armature, measured between the rings or brushes, or from positive to negative terminals.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
139
Q

ARMATURE SLOT

A

The groove or slot in the armature core, into which the coils or windings are placed.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
140
Q

ARMATURE TESTER

A

Any device used for locating faults or defects in the armature winding.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
141
Q

ARMATURE VARNISH

A

Is a liquid put on the field and armature windings, to improve the insulation of the cotton covering on the wires.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
142
Q

ARMATURE WINDING

A

All of the copper wire placed on the armature, and through which the current flows.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
143
Q

AROMATICS

A

A group of hydrocarbons of which benzene is the parent. They are called “aromatics” because many of their derivatives have sweet or aromatic odorous.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
144
Q

ARTIFICIAL MAGNET

A

Is a manufactured magnet, which is distinguished from a natural occurring magnet.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
145
Q

ASHRAE

A

The American Society of Heating, Refrigeration, and Air Conditioning Engineers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
146
Q

ASME

A

American Society of Mechanical Engineers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
147
Q

ASME APPENDIX SECTION I

A

Explains matter which is mandatory, unless specifically referred to in the rules of the code, including formulas.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
148
Q

ASME BOILER CODE

A

The boiler code listing standards, specified by the American Society of Mechanical Engineers, for the construction of boilers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
149
Q

ASME PART PEB SECTION I

A

Requirements for electric boilers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
150
Q

ASME PART PFH SECTION I

A

Requirements for feedwater heaters.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
151
Q

ASME PART PFT SECTION I

A

Requirements for firetube boilers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
152
Q

ASME PART PG SECTION I

A

General requirements for all methods of construction.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
153
Q

ASME PART PMB SECTION I

A

Requirements for miniature boilers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
154
Q

ASME PART PVG SECTION I

A

Requirements for organic fluid vaporizer generators.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
155
Q

ASME PART PW SECTION I

A

Requirements for boilers fabricated by welding.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
156
Q

ASME PART PWT SECTION I

A

Requirements for watertube boilers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
157
Q

ASME SECTION I

A

Power Boilers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
158
Q

ASME SECTION II

A

Material specifications.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
159
Q

ASME SECTION III

A

Nuclear Power Plant Components.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
160
Q

ASME SECTION IV

A

Heating boilers.ASME SECTION IX ASME SECTION V

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
161
Q

ASME SECTION VI

A

Recommended rules for the care and operation of heating boilers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
162
Q

ASME SECTION VII

A

Recommended rules for the care and operation of power boilers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
163
Q

ASME SECTION VII APPENDIX

A

Consists of conversion factors for converting Imperial units to SI Units.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
164
Q

ASME SECTION VII SUBSECTION C1

A

Rules for routine operation of power boilers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
165
Q

ASME SECTION VII SUBSECTION C2

A

Operating and maintaining boiler appliances.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
166
Q

ASME SECTION VII SUBSECTION C3

A

Rules for inspection.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
167
Q

ASME SECTION VII SUBSECTION C4

A

Prevention of direct causes of boiler failure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
168
Q

ASME SECTION VII SUBSECTION C5

A

Is partial rules for the design of installations.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
169
Q

ASME SECTION VII SUBSECTION C6

A

Operation of boiler auxiliaries.

170
Q

ASME SECTION VII SUBSECTION C7

A

Control of internal chemical conditions.

171
Q

ASME SECTION VIII

A

Pressure vessels.

172
Q

ASME SECTION XI

A

Rules for inservice inspection of Nuclear Power Plant components.

173
Q

ASPIRATING PSYCHROMETER

A

A device which draws sample of air through it to measure humidity.

174
Q

ASPIRATION

A

Production of movement in a fluid by suction created by fluid velocity.

175
Q

ASTM

A

American Society for Testing and Materials.

176
Q

ASYNCHRONOUS

A

Not having the same frequency. Out of step, or phase.

177
Q

ASYNCHRONOUS GENERATOR

A

An induction generator.

178
Q

ASYNCHRONOUS MOTOR

A

An induction motor, whose speed is not synchronous with the frequency of the supply line.

179
Q

ATMOSPHERE

A

Is the mixture of gases and water vapor surrounding the earth.

180
Q

ATMOSPHERIC PRESSURE

A

Pressure exerted by the weight of the atmosphere

181
Q

ATOM

A

The smallest complete particle of an element, which can be obtained, yet which retains all physical and chemical properties of the element.

182
Q

ATOMIC NUMBER

A

The number of protons found in the nucleus of an atom, of an element.

183
Q

ATOMIC WEIGHT

A

The weight of an elementary atom, in relation to the weight of an atom of hydrogen. A hydrogen atom being taken as 1.00g.

184
Q

ATOMIZE

A

Process of changing a liquid to minute particles or a fine spray.

185
Q

ATTEMPERATING WATER IMPURITY

A

Refers to turbine deposits caused by impurities in the water used for attemperators. (Chemicals used with attemperating water should be of the

186
Q

ATTEMPERATOR

A

An apparatus for reducing and controlling the temperature of a superheater vapor or a fluid.

187
Q

ATTENUATION

A

The sound reduction process in which sound energy is absorbed or diminished in intensity as the result of energy conversion from sound to motion or heat.

188
Q

ATTRITION

A

The rubbing of one particle against another in a resin bed

189
Q

AUTOMATIC CONTROL

A

The process of using the differences, between the actual value, and desired value, of any variable, to take corrective action, without human intervention.

190
Q

AUTOMATIC CONTROLLER

A

A device that measures the value of a measured variable, and operates to correct or limit the deviation from a selected reference. Both measuring and

191
Q

AUTOMATIC DEFROST

A

System of removing ice and frost from evaporators automatically.

192
Q

AUTOMATIC EXPANSION VALVE (AEV)

A

A type of metering device that senses low

193
Q

AUTOMATIC EXTRACTION UNIT TURBINE

A

Bleeds off part of the main steam flow at one, two, or three points. Valved partitions between selected stages control the extracted steam

194
Q

AUTOMATIC FROST CONTROL

A

Control which automatically cycles refrigerating system to remove frost formation on evaporator.

195
Q

AUTOMATIC GOVERNING SYSTEM

A

A system which correlates steam flow, pressure, shaft speed, and shaft output, for any one turbine unit.

196
Q

AUTOMATIC ICE CUBE MAKER

A

Refrigerating mechanism designed to automatically produce ice cubes in quantity.

197
Q

AUTOMATIC RESET (INTEGRATION)

A

Is a type of control, in which the controller output, changes at a rate proportional to the deviation or error. The output will continue to change

198
Q

AUTOTRANSFORMER

A

A transformer in which both primary and secondary coils, have turns in common. The step up or step down of voltage, is accomplished by taps in common

199
Q

AUXILIARY CONTACTS

A

A set of contacts that perform a secondary function, usually in relation to the operation of a set of primary contacts.

200
Q

AVAGADRO’S HYPOTHESIS

A

States that equal volumes of different gases, at the same temperature and pressure, will contain equal numbers of molecules.

201
Q

AVAGADRO’S NUMBER (N)

A

The number of elementary units such as atoms, formula units, molecules, or ions, that constitute one mole of the said particle.

202
Q

AVERAGING ELEMENT

A

A thermostat sensing element which will respond to the average duct temperature.

203
Q

AXIAL FLOW COMPRESSOR

A

Uses rotor blades shaped like airfoils, to bite into the air, speed it up, and push it into the subsequent stationary blade passages. These passages are

204
Q

AZEOTROPE

A

Having constant maximum and minimum boiling points.

205
Q

BACK PRESSURE

A

Pressure in low side of refrigerating system

206
Q

BACK SEATING

A

Fluid opening/closing such as a gauge opening or to seal the joint where the valve stem goes through the valve body.

207
Q

BACK WORK RATIO

A

Is the fraction of the gas turbine work used to drive the compressor.

208
Q

BACKGROUND NOISE

A

Sound other than the wanted signal. In room acoustics, the irreducible noise level measured in the absence of any building occupants.

209
Q

BACKING RING

A

Backing in a form of a ring, generally used in welding of piping.

210
Q

BACKWASH

A

The counter

211
Q

BACTERIA

A

Microscopic unicellular living organisms.

212
Q

BAFFLE

A

Plate or vane used to direct or control movement of fluid or air within confined area.

213
Q

BAGHOUSE

A

A chamber containing bags for filtering solids out of gases.

214
Q

BALLAST GAS

A

Are the nonflammable portion of the gas, such as carbon dioxide.

215
Q

BAROMETER

A

Instrument for measuring atmospheric pressure. It may be calibrated in pounds per square inch, in inches of mercury in a column in millimeters or kPa.

216
Q

BASE

A

An alkaline substance.

217
Q

BASE METAL

A

The metal present in the largest proportion in an alloy. (Copper is the base metal in brass)

218
Q

BASE METAL

A

The substrate metal that is coated or protected by a surface coating.

219
Q

BASICITY

A

The ability of a substance to boost the pH after neutralizing all the acid species.

220
Q

BATCH OPERATION

A

The utilization of ion

221
Q

BAUDELOT COOLER

A

Heat exchanger in which water flows by gravity over the outside of the tubes or plates.

222
Q

BEARING, AIR

A

A bearing using air as a lubricant.

223
Q

BEARING, ALIGNING

A

A bearing with an external spherical seat surface that provides a compensation for shaft or housing deflection or misalignment.

224
Q

BEARING, ANNULAR

A

Usually a rolling bearing of short cylindrical form supporting a shaft carrying a radial load.

225
Q

BEARING, ANTI

A

FRICTION

226
Q

BEARING, BABBIT

A

A bearing metal of non

227
Q

ferrous material, containing several tin

A

based alloys, mainly copper, antimony, tin and lead.

228
Q

BEARING, BALL

A

A rolling element bearing in which the rolling elements are spherical.

229
Q

BEARING, BIG END

A

A bearing at the larger (crankshaft) end of a connecting rod in an engine.

230
Q

BEARING, BIMETAL

A

A bearing consisting of two layers.

231
Q

BEARING, BOTTOM END

A

(see bearing, big end)

232
Q

BEARING, BUSH

A

A plain bearing in which the lining is closely fitted into the housing in the form of a bush, usually surfaced with a bearing alloy.

233
Q

BEARING, CIRCULAR STEP

A

A flat circular hydrostatic bearing with a central circular recess.

234
Q

BEARING, FIXED PAD

A

An axial or radial load bearing equipped with fixed pads, the surface of which a are contoured to promote hydrodynamic lubrication.

235
Q

BEARING, FLOATING

A

A bearing designed or mounted to permit axial displacement between shaft and housing.

236
Q

BEARING, FLOATING RING

A

A type of journal bearing that includes a thin ring between the journal and the bearing. The ring floats and rotates at a fraction of the journal rotational

237
Q

BEARING, FLUID

A

(see hydrostatic bearing)

238
Q

BEARING, FULL JOURNAL

A

A journal bearing that surrounds the journal by a full 360°.

239
Q

BEARING, GAS

A

A journal or thrust bearing lubricated with gas.

240
Q

BEARING, HALF JOURNAL

A

A bearing extending 180° around a journal.

241
Q

BEARING, JOURNAL

A

A machine part in which a rotating shaft revolves or slides.

242
Q

BEARING, MAGNETIC

A

A type of bearing in which the force that separates the relatively moving surfaces is produced be a magnetic field.

243
Q

BEARING, MAIN

A

A bearing supporting the main power

244
Q

BEARING, MITCHELL

A

(see tilting pad bearing).

245
Q

BEARING, NEEDLE

A

A bearing in which the relatively moving parts are separated by long thin rollers that have a length

246
Q

BEARING, NONCONTACT

A

A bearing in which no solid contact occurs between relatively moving surfaces.

247
Q

BEARING, PEDESTAL

A

A bearing that is supported on a column or pedestal rather than on the main body of the machine.

248
Q

BEARING, POROUS

A

Made from porous material, such as compressed metal powders, the pores acting either as reservoirs for holding or passages for supplied lubricant.

249
Q

BEARING, ROLLER

A

A bearing in which the relatively moving parts are separated by rollers.

250
Q

BEARING, RUBBING

A

A bearing in which the relatively moving parts slide without deliberate lubrication.

251
Q

A roller

A

element bearing with one spherical raceway that automatically provides compensation for shaft or housing deflection or misalignment.

252
Q

A bearing independent of external lubrication. These bearings may be sealed for life after packing with grease or may contain self

A

lubricating material.

253
Q

BEARING, SLEEVE

A

A cylindrical plain bearing used to provide radial location for a shat, which moves axially. Sleeve bearings consist of one or more layers of bearing alloys, bonded to

254
Q

BEARING, SLIDE

A

A bearing used or positioning a slide or for axial alignment of a long rotating shaft.

255
Q

BEARING, STEP

A

A plane surface bearing that supports the lower end of a vertical shaft.

256
Q

BEARING, THRUST

A

A bearing in which the load acts in the direction of the axis of rotation.

257
Q

BEARING, TILTING PAD

A

A pad bearing in which the pads are free to take up a position at an angle to the opposing surface according to the hydrodynamic pressure distribution over

258
Q

BEARING, TRUNNION

A

A bearing used as a pivot to swivel or turn an assembly.

259
Q

BELLOWS

A

Corrugated cylindrical container which moves as pressures change, or provides a seal during movement of parts.

260
Q

BELLOWS SEAL

A

A type of mechanical seal that utilizes a bellows for providing secondary sealing.

261
Q

BIMETAL STRIP

A

Temperature regulating or indicating device which works on principle that two dissimilar metals with unequal expansion rates, welded together, will bend as

262
Q

BIMETALLIC COUPLE

A

A joint or union of two dissimilar metals.

263
Q

BIOCIDE

A

A chemical used to control the population of troublesome microbes.

264
Q

BLACK LIQUOR

A

The liquid material remaining from pulpwood cooking in the soda or sulfate papermaking process.

265
Q

BLAST FURNACE GAS

A

Is the waste product from furnaces used to smelt iron ores.

266
Q

BLEEDER VALVE

A

A valve designed to slowly relief a liquid or gas form system.

267
Q

BLEEDING

A

Slowly reducing the pressure of liquid or gas from a system or cylinder by slightly opening a valve.

268
Q

BLEEDOFF

A

The continuous removal of water from a re

269
Q

BLEEDOFF RATE

A

The rate at which water is continuously removed from a system.

270
Q

BLOWDOWN

A

In connection with boilers or cooling towers, the process of discharging a significant portion of the aqueous solution in order to remove accumulated salts, deposits and

271
Q

BOILER

A

Closed container in which a liquid may be heated and vaporized.

272
Q

BOILER FEED WATER

A

The total water fed to a boiler producing steam. This water is the mixture of return steam condensate and makeup water.

273
Q

BOILER HORSEPOWER

A

The work required to evaporate 34.5 lb of water per hour into steam from and at 100°C.

274
Q

BOILER LAY

A

UP

275
Q

BOILING

A

(See vaporization)

276
Q

BOILING OUT

A

The boiling of high alkaline water in boiler pressure parts for the removal of oil, greases, prior to normal operation or after major repairs.

277
Q

BOILING POINT

A

The temperature at which the vapor pressure of a liquid equals the absolute external pressure at the liquid

278
Q

BOILING TEMPERATURE

A

Temperature at which a fluid changes from a liquid to a gas.

279
Q

BORE

A

Inside diameter of a cylinder.

280
Q

BOURDON TUBE

A

Thin

281
Q

BOYLES’ LAW

A

If the temperature on a gas is constant, the volume is inversely proportional to the pressure. By formula

282
Q

BRANCH CIRCUIT

A

Wiring between the last overcurrent device and the branch circuit outlets.

283
Q

BRASS

A

A copper

284
Q

BRAYTON CYCLE (also referred to as the Joule Cycle)

A

A rotating machine in which compression and expansion take place. Gas turbine are such an example.

285
Q

BRAZE

A

A weld produced by heating an assembly to suitable temperatures and by using a filler metal having a liquidus above 450°C. The filler metal is distributed between the closely

286
Q

BRAZING, BLOCK

A

A brazing process in which the heat required is obtained from heated blocks applied to the parts to be joined.

287
Q

BREAKTHROUGH

A

The first appearance in the solution flowing from an ion

288
Q

BRINE

A

Water saturated with a chemical such as salt.

289
Q

BRITISH THERMAL UNIT, (BTU)

A

The Btu is defined as the heat required to raise the temperature of a pound of water from 59° to 60°F.

290
Q

BRITTLENESS

A

The tendency of a material to fracture without first undergoing significant plastic deformation.

291
Q

BRONZE

A

A copper

292
Q

BTU

A

British Thermal Unit.

293
Q

BYPASS

A

A pipe or duct, usually controlled by valve or damper, for conveying a fluid around an element of a system.

294
Q

BYPASS

A

Passage at one side of, or around, a regular passage.

295
Q

BYPASS FEEDER

A

A closed tank that is installed in a system in “bypass,” that is, in a side stream taken off the system and leading back to the system rather than directly in

296
Q

BY

A

PASS GOVERNING

297
Q

CALCAREOUS COATING OR DEPOSIT

A

A layer consisting of a mixture of calcium carbonate and magnesium hydroxide deposited on surfaces being cathodically protected against

298
Q

CALCIUM

A

A scale forming element found in boiler feedwater.

299
Q

CALCIUM CHLORIDE

A

A substance used to obtain calcium chloride brine.

300
Q

CALCIUM SULFATE

A

Chemical compound (CaSO4) which is used at a drying agent or desiccant in liquid line dryers.

301
Q

CALIBRATION

A

A process of dividing and numbering the scale of an instrument

302
Q

CALORIE

A

It is equal to the amount of heat required to raise the temperature of one gram of water one degree Celsius.

303
Q

CALORIMETER

A

Device used to measure quantities of heat or determine specific heats.

304
Q

CANGE OF STATE

A

Change from one phase, such as solid, liquid or gas, to another.

305
Q

CAPACITANCE

A

The property of an electric current that permits the storage of electrical energy in an electrostatic field and the release of that energy at a later time.

306
Q

CAPACITOR, (CONDENSER)

A

A device that can store an electric charge when voltage is applied.

307
Q

CAPACITY

A

The adsorption activity possessed in varying degrees by ion

308
Q

exchange materials. This quality may be expressed as kilograins per cubic foot, gram

A

milliequivalents per gram,

309
Q

pound

A

equivalents per pound, gram

310
Q

CAPILLARY

A

The name given to the thin tube attached to the bulb which transmits the bulb pressure changes to the controller or indicator. The cross sectional area of the capillary is

311
Q

CAPILLARY TUBE

A

The capillary tube is a metering device made from a thin tube approximately 0.5 to 6 metre long and from 0.025 to 0.090 inches in diameter which feeds liquid directly

312
Q

CARBON DIOXIDE

A

Compound of carbon and oxygen (CO2) which is sometimes used as a refrigerant. Refrigerant number is R

313
Q

CARBON FILTER

A

Air filter using activated carbon as air cleansing agent.

314
Q

CARBON TETRACHLORIDE

A

Colorless nonflammable and very toxic liquid used as a solvent. It should never be allowed to touch skin and fumes must not be inhaled.

315
Q

CARBONACEOUS EXCHANGER

A

Ion

316
Q

CARBONATE

A

An ion or salt of carbonic acid, containing carbon and oxygen such as calcium carbonate. (CaC03)

317
Q

CARBONATE HARDNESS

A

That hardness caused in water by bicarbonates and carbonates of calcium, and magnesium.

318
Q

CARBONATE

A

POLYMER TREATMENT

319
Q

A treatment method using synthetic polymers, generally used with high hardness (60

A

70) ppm and high alkalinity.

320
Q

CARBOXYLIC

A

A term describing a specific acidic group (COOH) that contributes cation

321
Q

CARRYOVER

A

The moisture and entrained solids forming the film of steam bubbles, as a result of foaming in a boiler. This condition is caused by a faulty boiler water condition. See

322
Q

CASCADE

A

A series of stages in which the output of one stage is the input of the next stage.

323
Q

CASCADE SYSTEMS

A

Arrangement in which two or more refrigerating systems are used in series

324
Q

ultra

A

low temperatures.

325
Q

CATHODE

A

In electrolysis or electrochemical corrosion, a site on a surface where actions in solution are neutralized by electrons to become elements that either plate out on the surface

326
Q

CATHODIC PROTECTION

A

A method of preventing corrosion by making the metal a cathode in a conducting medium by means of a direct electrical current that is galvanic.

327
Q

CATHODIC PROTECTION

A

Reduction of corrosion rate by shifting the corrosion potential of the electrode towards less oxidizing potential by applying an external electromotive force.

328
Q

CATION

A

A positively charged ion that migrates through the electrolyte toward the cathode under the influence of a potential gradient.

329
Q

CATION

A

EXCHANGE SOFTENERS

330
Q

CATIONIC

A

The condition of a polymer, colloid, or large particle having exchangeable anions on its surface and an opposite, positive charge on the substrata.

331
Q

CAUSTIC CRACKING

A

A form of stress

332
Q

corrosion cracking most frequently encountered in carbon steels or iron

A

chromium

333
Q

CAUSTIC EMBRITTLEMENT

A

An obsolete term replaced by caustic cracking.

334
Q

CAUSTIC SODA

A

A common water treatment chemical, sodium hydroxide.

335
Q

CAVITATION

A

The formation and collapse, within a liquid, of cavities or bubbles that contain vapor or gas or both. In general, cavitation originates from decreases in static pressure in

336
Q

CAVITATION EROSION

A

Progressive loss of original material from a solid surface due to continuing exposure to cavitation.

337
Q

CELSIUS TEMPERATURE SCALE

A

A thermometric scale in which the freezing point of water is called 0°C and its boiling point 100°C at normal atmospheric pressure.

338
Q

CENTANE NUMBER

A

A measure of ignition quality of a fuel or petroleum with reference to normal centane high

339
Q

CENTRIFUGAL COMPRESSOR

A

Pump which compresses gaseous fluids by centrifugal force.

340
Q

CENTRIFUGAL FORCE

A

On a centrifugal pump, it is that force which throws water from a spinning impeller.

341
Q

CENTRIFUGAL PUMP

A

A pump consisting of an impeller fixed on a rotating shaft and enclosed in a casing, having an inlet and a discharge connection. The rotating impeller creates

342
Q

CENTRIFUGAL PUMP

A

Pump which produces fluid velocity and converts it to pressure head.

343
Q

CHANGE OF STATE

A

Condition in which a substance changes from a solid to a liquid or a liquid to a gas caused by the addition of heat. Or the reverse, in which a substance changes

344
Q

CHANNELING

A

Cleavage and furrowing of the bed due to faulty operational procedure, in which the solution being treated follows the path of least resistance, runs through these

345
Q

CHARGE

A

Amount of refrigerant placed in a refrigerating unit.

346
Q

CHARGING BOARD

A

Specially designed panel or cabinet fitted with gauges, valves and refrigerant cylinders used for charging refrigerant and oil into refrigerating mechanisms.

347
Q

CHECK VALVE

A

Device which permits fluid flow in one direction.

348
Q

CHELATE

A

Is a molecule, similar to an ion exchanger, capable to withdraw ions from their water solutions into soluble complexes.

349
Q

CHEMICAL CLEANING

A

Using a solvent solution to remove mill scale and corrosion products.

350
Q

CHEMICAL FEEDLINE

A

The line which feeds the boiler treatment chemicals into the boiler.

351
Q

CHEMICAL PRECIPITATION

A

When the chemicals react with the dissolved minerals in the water to produce a relative insoluble reaction product. A typical example of this takes place

352
Q

with the lime

A

soda softening process.

353
Q

CHEMICAL REFRIGERATION

A

System of cooling using a disposable refrigerant. Also called an expendable refrigerant system.

354
Q

CHEMICAL STABILITY

A

Resistance to chemical change which ion

355
Q

CHILL FACTOR

A

Calculated number based on temperature and wind velocity.

356
Q

CHILLED

A

WATER SYSTEM

357
Q

A re

A

circulating water system using water chilled in a refrigeration machine as a source for cooling.

358
Q

CHILLER/HEATERS

A

A unit that supplies either chilled water for cooling or hot water for heating, (HVAC).

359
Q

CHLORIDE

A

An ion, compound, or salt of chlorine, such as sodium chloride (NaCl) or calcium chloride (CaCl2).

360
Q

CHLORINATION

A

A process in which chlorine gas or other chlorine compounds are added to the water for the purpose of disinfecting.

361
Q

CHOKE TUBE

A

Throttling device used to maintain correct pressure difference between high

362
Q

side and low

A

side in refrigerating mechanism. Capillary tubes are sometimes called choke

363
Q

CHORDAL THERMOCOUPLE

A

A thermocouple installed in furnace tubes, designed to measure the effectiveness of water treatment within the boiler.

364
Q

CIRCUIT

A

An electrical arrangement requiring a source of voltage, a closed loop of wiring, an electric load and some means for opening and closing it.

365
Q

CIRCUIT BREAKER

A

A switch

366
Q

CLAY

A

Finely suspended earth mineral sometimes found as an impurity in water.

367
Q

CLEARANCE SPACE

A

Space between top of piston and the valve plate.

368
Q

CLEARANCE VAPOR

A

The vapor remaining in the clearance space at the end of each discharge stroke.

369
Q

CLOSED CYCLE

A

is the gas turbine arrangement, in which the exhaust is directed back again to compressor without coming in contact with the atmospheric air.

370
Q

CLOSED FEEDWATER HEATER

A

An indirect

371
Q

CLOSED RE

A

CIRCULATING WATER SYSTEM

372
Q

A system using as a heat

A

transfer medium water that continuously circulates through closed piping and heat exchanger without

373
Q

COCOAGULANT

A

A substance that promotes the clumping of particulate matter in water, forming a larger mass and thus promoting settling of particulates and clarification of the water.

374
Q

COAGULATION

A

Is the process whereby finely divided particles of turbidity and color, capable of remaining in suspension indefinitely, are combined by chemical means into masses

375
Q

COALESCENCE

A

The gathering together of coagulated colloidal liquids into a single continuous phase.

376
Q

CODE INSTALLATION

A

Refrigeration or air conditioning installation which conforms to the local code and/or the national code for safe and efficient installations.

377
Q

CO

A

EFFICIENT OF CONDUCTIVITY

378
Q

COEFFICIENT OF EXPANSION

A

A measure of the change in length or volume of an oject, specifically, a change measured by the increase in length or volume of an object per unit

379
Q

COEFFICIENT OF FRICTION

A

The dimensionless ratio of the friction force (F) between two bodies to the normal force (N) pressing these bodies together

380
Q

COEFFICIENT OF PERFORMANCE (COP)

A

Ratio of work performed or accomplished as compared to the energy used under designated operating conditions.

381
Q

COGENERATION

A

A term used to describe the combination of different thermodynamic cycles for the purpose of increasing all

382
Q

CO

A

GENERATION GENERATION

383
Q

a term applied to identify the generation of people interested in co

A

generation.

384
Q

COLD

A

The absence of heat

385
Q

COLD DECK

A

The cooling section of a mixed air zoning system.

386
Q

COLD JUNCTION

A

That part of a thermoelectric system which absorbs heat as the system operates.

387
Q

COLD PROCESS

A

A water treatment process carried out at room temperature.

388
Q

COLD WALL

A

Refrigerator construction which has the inner lining of refrigerator serving as the cooling surface.

389
Q

COLLOIDAL

A

A state of suspension in a liquid medium in which extremely small particles are suspended and dispersed but not dissolved.

390
Q

COLLOIDS

A

Organic matter of very fine particle size, usually in the range of 10

391
Q

5 to 10

A

7 cm in diameter. It tends to inhibit the formation of dense scale and results in the deposition of

392
Q

COLUMN OPERATION

A

Conventional utilization of ion

393
Q

COMBINED FEEDER CUTOFF

A

A device that regulates makeup water to a boiler in combination with a low

394
Q

COMBINED STEAM

A

GAS PLANT

395
Q

COMBINED TREATMENT

A

A method of physical treatment , followed by the addition of chemicals to remove oxygen.

396
Q

COMBUSTION

A

The act or process of burning.

397
Q

COMFORT CHART

A

A chart showing effective temperatures with dry

398
Q

COMFORT COOLER

A

System used to reduce the temperature in the living space in homes. These systems are not complete air conditioners as they do not provide complete control of

399
Q

COMFORT COOLING

A

Refrigeration for comfort as opposed to refrigeration for storage or manufacture.

400
Q

COMFORT ZONE

A

(Average) the range of effective temperatures over which the majority (50 percent or more) of adults feels comfortable

401
Q

COMMON NEUTRAL

A

A neutral conductor that is common to, or serves, more than one circuit.

402
Q

COMPOSITION

A

The elements or chemical components that make up a material and their relative proportions.

403
Q

COMPOUND

A

They are chemically combined elements with definite proportions of the component elements.

404
Q

COMPOUND GAUGE

A

Instrument for measuring pressures both above and below atmospheric pressure.

405
Q

COMPOUND REFRIGERATING SYSTEMS

A

System which has several compressors or compressor cylinders in series. The system is used to pump low pressure vapors to condensing

406
Q

COMPRESSION

A

Term used to denote increase of pressure on a fluid by using mechanical energy.

407
Q

COMPRESSION RATIO

A

Ratio of the volume of the clearance space to the total volume of the cylinder. In refrigeration it is also used as the ratio of the absolute low

408
Q

the absolute high

A

side pressure.

409
Q

COMPRESSION, ADIABATIC

A

Is compressing a gas without removing or adding heat.

410
Q

COMPRESSOR

A

Pump of a refrigerating mechanism which draws a low pressure on cooling side of refrigerant cycle and squeezes or compresses the gas into the high

411
Q

COMPRESSOR

A

The pump which provides the pressure differential to cause fluid to flow and in the pumping process increases pressure of the refrigerant to the high side condition.

412
Q

COMPRESSOR DISPLACEMENT

A

Volume, in cubic inches, represented by the area of the compressor piston head or heads multiplied by the length of the stroke.

413
Q

COMPRESSOR SEAL

A

Leak proof seal between crankshaft and compressor body in open type compressors.

414
Q

COMPRESSOR SURGING

A

An instability of air flow with axial compressor on the first stages of these compressors. Air flow might even be reversed that point.

415
Q

COMPRESSOR TURBINE

A

in terms of a gas turbine arrangement, it is the turbine which drives the compressor only.

416
Q

COMPRESSOR, CLEARANCE POCKET

A

Small space in a cylinder from which compressed gas is not completely expelled. This space is called the compressor clearance space or

417
Q

COMPRESSOR, ROTARY BLADE

A

Mechanism for pumping fluid by revolving blades inside cylindrical housing.

418
Q

COMPRESSOR, SINGLE

A

STAGE

419
Q

Compressor having only one compressive step between low

A

side pressure and high

420
Q

COMRESSIBILITY

A

The ease which a fluid may be reduced in volume by the application of pressure, depends upon the state of the fluid as well as the type of fluid itself.

Power Engineering Terms (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions