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Local 30 Test Review > Joe’s Answers > Flashcards

Joe’s Answers Flashcards

1
Q

A vane pump is a positive displacement pump so…

A

A vane pump should never be operated with the discharge valve closed

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2
Q

Which of the following statements is correct based on the following statement? All moving parts in a mechanical system must be lubricated. A piston in a cylinder is a moving part. Grease is a lubricant therefore:

A

A cylinder must be lubricated with lubricant

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3
Q

The engineer asks you to check the FM of a standard “24×24” diffuser.
What is the best part/tool to use

A

Flow hood

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4
Q

What type of valve would you find on a pre heat coil

A

Normally open

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5
Q

What gauge is used to measure differential (pressure?) across the filter bank

A

Magnehelic Gauge

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6
Q

Which tool is used to measure very high temperature

A

pyrometer

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7
Q

Centrifugal Force is created in a centrifugal pump when water passes into in a rotating impeller and:

A

Kinetic energy overcomes potential energy

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8
Q

What are three dynamic pumps and what are dynamic pumps

A

Dynamic pumps are non-positive displacement pumps

turbo pump, centrifugal pump, axial pump

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9
Q

two methods used to monitor flue gas density in a breaching or stack?

A

opacity meter and Ringelmann chart

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10
Q

A turbine that is compared to a Lawn Sprinkler when functioning is a

A

reaction turbine

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11
Q

Caustic Embrittlement in a Steam boiler is a result of

A

High ph. levels / high concentration of sodium hydroxide (NaOH) in the boiler water

(theyre the same thing)

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12
Q

A centrifugal pump when used as a boiler feed water pump should have the Capacity of

A

enough capacity to deliver (2) times the maximum steam capacity of the Boiler.

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13
Q

If the pressure available to the suction side of a pump drops below the NPSHR what will happen at the pump?

A

Caviation

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14
Q

What is one thing the Unloader on a reciprocating air compressor does

A

keeps the suction valve open on startup to lower the starting amps on the motor

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15
Q

What device is used on fluid coupling to permit hot oil to escape of excessive overloading occurs

A

Fusible plug

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16
Q

Your engineer asks you to grease a “10 plug” valve. What type of grease filling would you most likely find on the plug valve?

A

Button

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17
Q

Some synthetic oils for refrigeration are

A

alkylbenzenes, glycols, esters, mineral oil

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18
Q

Which of the following method of lubrication uses centrifugal force to distribute the oil to the bearing

A

oil ring

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19
Q

In terms of refrigerant, what does POE and MO best likely

A

Polyesters and mineral oil

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20
Q

An object that consist of two electrical conductors of dissimilar materials that are joined at the end to form a circuit is known as

A

A thermocouple

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21
Q

The hydronic pump on box (x) has a suction of 10 PSI and discharge of 25 PSI. The expansion tank is pre charge to 12PSI. What is the pressure point c where the expansion tank is joined to the hydronic system?

A

12

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22
Q

When inspecting a wire rope for possible damage, which of the following is NOT a condition you would look for

A

wire drawing

(wrong answers: Core protection, Bird Caging, Kinking)

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23
Q

Your chief engineer asked you to select the grade 5 bolt from the storeroom with the assorted bolts. Which of the following will you choose?

A

Bolt with 3 marks on the head

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24
Q

Smoke density in a stack is monitored by?

A

Ringelmann chart

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25
Q

Which boiler room equipment can reduce dissolved oxygen in feed water to a level as low as 5PMM before chemicals are added

A

Joe- Water Softener

Internet- Deaerator

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26
Q

Which of the following is best to follow when starting a centrifugal pump

A

Closed Discharged Valve, Fill suction side or priming the pump

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27
Q

Oiler doing his rounds observe noisy and the compressor vibrating

A

Most likely loose anchor bolt

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28
Q

Oiler Doing his rounds notice pressure on the discharge is low, on a centrifugal pump, power is on, RPM the same on name Plate and No leaks. What other factor can cause to low discharge.

A

Wearing plate

can also be collapsed suction hose lining or a plugged suction line

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29
Q

Tool used to measure Air Flow rate

A

anemometer

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30
Q

A tank measuring 18ft x 10ft x 8ft. Estimate the capacity in gallon if 1 Cubic = 7.48-gal


A

18x10x8 = Divide By 7.48 gal

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31
Q

An AHU uses 3 - 20x20x2 and 4 - 24x20x2 Filter. How much filter is needed per year it is changed Quarterly

A

12 and 16

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32
Q

A compressor uses 6 pints of lubricating oil if 4 oil change is recommended per year by the manufacture, how many pints is needed per year?

A

24 pints

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33
Q

A building is 2400 Sq ft if 4000 BTU is required to cool 200 Sqft how many BTU is required to cool the entire building.

A

48000 BTU

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34
Q

While doing your rounds you notice excessive vibration on motor loose set screw. The correct tool to use is

A

allen key

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35
Q

For a clogged Duplex strainer a suction and discharge gauge will appear

A

In a deeper vacuum

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36
Q

In an electric circuit the letter E is

A

voltage

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37
Q

What ABC fire extinguishers put out

A

A- Ordinary Combustibles. ex. wood, paper, cloth

B- Flammable Liquids. ex. grease, oil, paint, solvents

C- Live Electrical Equipment. ex. electrical panel, motor, wiring

D- Combustible Metal Fires

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38
Q

Safety valve must prevent a boiler vessel from not exceeding?

A

6% MAWP

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39
Q

Calcium carbonate and magnesium carbonate if not removed from the boiler feed water will cause

A

Scaling of the tubes

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40
Q

What is deadband

A

No heating /takes place

a temperature range in which neither heating nor cooling system turns on

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41
Q

Cooling Tower

A

cross flow and counter flow

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42
Q

Water tube A Type Boiler has

A

One steam drum and two mud drums

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43
Q

12 bolt tighten pattern

A

star pattern

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44
Q

If a gauge rated at 300 Psi reading 75 Psi

A

gauge is located between 9 and 10 o’clock

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45
Q

Stator

A

a row of small stationary airfoils attached to the casing of an axial-flow turbine, positioned between the rotors

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46
Q

rotor

A

the rotating element of a compressor connected to the motor drive

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47
Q

armature

A

the armature is the winding (or set of windings) of an electric machine which carries alternating current (AC)

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48
Q

Cooling Tower

A

Ans. cross flow and counter flow

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49
Q

Commutator

A

a rotatory electrical switch that reverses the direction of current between the rotor and the external circuit periodically

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50
Q

DC Motor

A

motor is defined as a class of electrical motors that convert direct current electrical energy into mechanical energy

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51
Q

Unit of electrical capacitance

A

Farad abbreviated F (or microfarad, µF)

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52
Q

Stuffing box

A

used to prevent leakage of fluid, such as water or steam

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53
Q

Packing gland

A

The gland packing is a contact-type sealing element. Compared with other types of shaft seals, they are adjustable and suitable for use with pressures and circumferential speeds higher than those radial shaft seal rings are used for

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54
Q

Lantern ring

A

help protect the stuffing box by allowing flush water or pressure to enter

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55
Q

Lock out Tag out a motor

(what do you do with a lockout tag key?)

A

keep the key yourself

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56
Q

Recovery Cylinder

A

yellow top grey body

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57
Q

BTU’s required to change liquid to a solid

A

144

58
Q

Bottoming tap tool ______

A

doesn’t taper

59
Q

A micro turbine will generate

A

30kw to 60kw

60
Q

Which steam trap has a single movable disc

A

thermodynamic steam trap

61
Q

Boiler natural draft can be best described as?

A

No fans, uses the height of the stack

62
Q

A step-down transformer from 440 Volts has 500 turns on the primary circuit. To reduce the voltage to 220V, how many turn should the wire make on the secondary side?

A

250

63
Q

Which feed water regulator uses heat difference in the generator to actuate bellows, which controls the regulating valve?

A

Thermohydraulic feedwater regulator

(wrong choices are thermoexpansion; Float feedwater; Three element feedwater regulator)

64
Q

Variable air volume (VAV)

A

Variable air volume systems or VAV boxes vary the air flow rates in different sections of a building, but keep all the air at the same temperature

65
Q

Multi-zone

A

A multi-zone HVAC uses one outdoor unit and multiple indoor units

66
Q

Single-zone

A

For a single-zone system, you have an outdoor and indoor unit. This setup is known as a one-to-one configuration, and it also includes a drain line, cable and line set

67
Q

Variable Refrigerant Flow (VRF)

A

VRF systems are ductless HVAC systems that use variable motor speeds to send different amounts of refrigeration to multiple evaporators in the system

68
Q

Air Source heat pumps (reversing valve)

A

A reversing valve is a type of valve and is a component in a heat pump, that changes the direction of refrigerant flow

69
Q

a 100 HP motor is operating at 30Hz. What is the new HP?

A

(50/100)^3 × 100
0.125 x 100 = 12.5 HP.

70
Q

Diesel oil temperature

A

165° to 175°

71
Q

Serpentine Belt is connected to

A

all auxiliary Engines

72
Q

Calculate suction lift of a pump

A

14.7/ 0.433= 33.91 feet

73
Q

Splash lubrication is achieved by the use of

A

A splash ring

74
Q

What does NLGI stand for

A

National Lubricating Grease Institute

75
Q

What type of packing is used in a reaction turbine

A

Labyrinth Seal

76
Q

NLGI #000 is which type of grease

A
  • 445-475 Penetration
  • common application: Gear boxes/ low temperature use
  • food equivalent: Ketchup
77
Q

The rotating part of a mechanical seal is

A

primary sealing ring

78
Q

The Stationary Part of a mechanical seal is

A

ceramic seal

79
Q

What is a vernier caliper used for

A

measuring the outside diameter of a bearing

80
Q

What is the best tool to use when removing a bearing from a shaft

A

(bearing) Puller

81
Q

What is the best device to use when pulling a vacuum on a condenser

A

A micron gauge

82
Q

How would you measure the speed of a motor

A

A tachometer

83
Q

What type of tap is used to start tapping a drill hole

A

taper tap

84
Q

Reverse acting vs Direct acting

A

Direct Acting increases the pressure in proportion to the rise of temperature

Reverse Acting pressure lowers when temperature increases, while rises in pressure when cooler

85
Q

What is a pyrometer used for

A

Measuring very high temperatures

86
Q

What is Psychrometer used for

A

Measuring air humidity

87
Q

You are asked to grease a 10’’ valve. What type of grease fitting will the valve most likely have?

A

Alemite or Button head

88
Q

How would you start a centrifugal pump, and why this way?

A

Closed discharge valve, Fill suction side, prime pumps: to lower the starting amperage

89
Q

An oiler notices that a pump discharge is low. If everything is good, RPMs, no leaks, etc. What is the possible problem?

A

Wearing rings (plates)

90
Q

How many gallons of water in a tank that measures 10x12x10

A

10x12x10x7.48= 8976 gallons per cubic feet (cubic foot of water=7.48 gallons)

91
Q

Diesel Engine Maintenance or items check

A
  • Timing Belts
  • Alternator
  • Governor
92
Q

Pump Coupling

A

the element used to connect the rotating pump shaft to the drive shaft of the motor; enabling the motor to efficiently transmit power to the pump. When a pump is close coupled, a separate coupling is not required as the motor is directly mounted to the pump on a single shaft

93
Q

Fan Damper position based on OA temperatures

A
  • On a hot or cold, less OA
  • On a “free cooling day” OA dampers open to maximum
94
Q

What is LEL or UEL

A
  • Lower explosive limit (LEL): The lowest concentration of gas or vapor which will burn or explode if ignited
  • Upper explosive limit (UEL): The highest concentration of gas or vapor which will burn or explode if ignited
  • Below the LEL, the mixture is to lean to burn. Above the UEL mixture is too rich to burn
95
Q

Where should a confined space permit be placed

A

At the entrance of the confined space

96
Q

Can the attendant enter a confined space if the entrant needs assistance

A

NO

97
Q

A pulley should be replaced when showing how much wear when using a pulley gauge

A

1/16th of an inch

98
Q

Merv 8 filter is considered

A

a minimum standard for a pre-filter

99
Q

Convert Celcius to Farenheit

A

F= C (1.8) + 32

100
Q

Convert Farenheit to Celcius

A

C= (F - 32)(5/9)

101
Q

A motor with a stator, rotor, armature, commutator

A

DC motor

102
Q

Types of rigging knots

A

Square knot, clove hitch, double half hitch, inside bowline, sheet bend

103
Q

OSHA regulations for ladders

A

When a ladder is leaned against the wall, the bottom of the ladder should be «one quarter of the ladders working length away from the wall.» For access to an elevated work surface, «extend the top of the ladder three feet above that surface» or secure the ladder at its top

104
Q

LOTO (lock out tag): Who keeps the Key

A

The person who placed the LOTO on the device

105
Q

Superheated valves are set to open-

A

before the main valves

106
Q

Boilers that operate at over 100 psi require

A

require 2 blowdown valves

107
Q

The flow of combustion gasses over the tubes is controlled by

A

The baffles

108
Q

The most important valve on a boiler is

A

safety valve

109
Q

When performing a hydrostatic test on a boiler that has a MAWP of 150 psi, the test pressure should be

A

225 psi, 1.5 times the MAWP

110
Q

A boiler generating 20,000 lbs of steam per hour must be supplied with at least

A

20,000lbs of water per hour

111
Q

Oxygen present in boiler water is removed by

A

Sodium Sulfite

112
Q

The order which zeolite softeners regenerates is

A

(BBR)
Backwash, Brine, Rinse

113
Q

Impurities on the surface of the boiler water such as grease, scum, and light dissolved solids are removed by

A

Surface Blow

114
Q

In a refrigeration system a halide torch is used for

A

Leak detection refrigeration

115
Q

What is the weight of a gallon of water at 62 degrees F

A

8.33 lbs/gallon

116
Q

An excessive amount of lubricating on a bearing my cause

A

Overheating/failure

117
Q

A closed water heater is best described as

A

An Economizer

118
Q

The remote control of the oil burner switch or chiller must be located

A

Outside each door to the boiler room/chiller plant

119
Q

When determining the acidity or alkalinity of a boiler water, the number 7 on the PH scale means the water is

A

Neutral

120
Q

The pressure vessel that removes oxygen from the make up feed water entering the boiler is known as a

A

Deaerator

121
Q

An economizer is used in a steam plant too

A

Pre-heat feedwater

122
Q

A low pressure steam heating boiler is a boiler operated at a pressure not to exceed

A

15 psi

123
Q

The pivot point on dampers and linkages should be cleaned and lubricated on a regular basis with

A

Dry lubricant

124
Q

On which of the following types of pumps has a volute?

A

Centrifugal

125
Q

In an F and T trap thermostatic element open to discharge

A

Air and non-condensable gasses

126
Q

When air is compressed by an air compressor it becomes

A

Hot

127
Q

To eliminate the danger of a furnace explosion during start up, the firing sequence must first allow for

A

A pre-purge

128
Q

It is noted that the outside surface of an operating evaporator coil for an air conditioning process is wet. This means?

A

The unit is working properly

129
Q

What is a non return valve and where is it placed

A

Its a check valve on the main steam header, located closest to the boiler

130
Q

The unloader on an air compressor is used for

A

Easy start for the motor

131
Q

How would you best describe the operational characteristic of a centrifugal refrigeration machine

A

A type of dynamic compressor, or turbo compressor with a radial design

132
Q

What do the letters SWP on the side of a valve represent

A

Steam Working Pressure

133
Q

What do the letters WOG on the side of a valve represent

A

Water, Oil, Gas

134
Q

A cooling tower will achieve a greater cooling effect on

A

A dry with low humidity

135
Q

What does “600 SWP” mean when stamped on a valve

A

Max pressure 600 psi for steam

136
Q

Diesel Engine =

Gasoline Combustion Engine =

A

= Compression

= Spark Plugs

137
Q

Comfort Cooling

A

Maintaining the ideal temperature and humidity for human comfort

VAV and VRF are related pretty sure

138
Q

For a clogged Duplex strainer a suction and discharge gauge will appear

A

In a deeper vacuum

139
Q

What is NPSHA and NPSHR

A
  • The Net Positive Suction Head Available at the pump impeller inlet

-The Net Positive Suction Head Required by the pump to operate without experiencing damaging cavitation

140
Q

MERV

A

Minimum Efficiency Reporting Value

Local 30 Test Review (2 decks)

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