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
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
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
4
Q
What type of valve would you find on a pre heat coil
A
Normally open
5
Q
What gauge is used to measure differential (pressure?) across the filter bank
A
Magnehelic Gauge
6
Q
Which tool is used to measure very high temperature
A
pyrometer
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
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
9
Q
two methods used to monitor flue gas density in a breaching or stack?
A
opacity meter and Ringelmann chart
10
Q
A turbine that is compared to a Lawn Sprinkler when functioning is a
A
reaction turbine
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)
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.
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
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
15
Q
What device is used on fluid coupling to permit hot oil to escape of excessive overloading occurs
A
Fusible plug
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
17
Q
Some synthetic oils for refrigeration are
A
alkylbenzenes, glycols, esters, mineral oil
18
Q
Which of the following method of lubrication uses centrifugal force to distribute the oil to the bearing
A
oil ring
19
Q
In terms of refrigerant, what does POE and MO best likely
A
Polyesters and mineral oil
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
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
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)
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
24
Q
Smoke density in a stack is monitored by?
A
Ringelmann chart
25
Which boiler room equipment can reduce dissolved oxygen in feed water to a level as low as 5PMM before chemicals are added
Joe- Water Softener
Internet- Deaerator
26
Which of the following is best to follow when starting a centrifugal pump
Closed Discharged Valve, Fill suction side or priming the pump
27
Oiler doing his rounds observe noisy and the compressor vibrating
Most likely loose anchor bolt
28
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.
Wearing plate
can also be collapsed suction hose lining or a plugged suction line
29
Tool used to measure Air Flow rate
anemometer
30
A tank measuring 18ft x 10ft x 8ft. Estimate the capacity in gallon if 1 Cubic = 7.48-gal
18x10x8 = Divide By 7.48 gal
31
An AHU uses 3 - 20x20x2 and 4 - 24x20x2 Filter. How much filter is needed per year it is changed Quarterly
12 and 16
32
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?
24 pints
33
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.
48000 BTU
34
While doing your rounds you notice excessive vibration on motor loose set screw. The correct tool to use is
allen key
35
For a clogged Duplex strainer a suction and discharge gauge will appear
In a deeper vacuum
36
In an electric circuit the letter E is
voltage
37
What ABC fire extinguishers put out
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
38
Safety valve must prevent a boiler vessel from not exceeding?
6% MAWP
39
Calcium carbonate and magnesium carbonate if not removed from the boiler feed water will cause
Scaling of the tubes
40
What is deadband
No heating /takes place
a temperature range in which neither heating nor cooling system turns on
41
Cooling Tower
cross flow and counter flow
42
Water tube A Type Boiler has
One steam drum and two mud drums
43
12 bolt tighten pattern
star pattern
44
If a gauge rated at 300 Psi reading 75 Psi
gauge is located between 9 and 10 o'clock
45
Stator
a row of small stationary airfoils attached to the casing of an axial-flow turbine, positioned between the rotors
46
rotor
the rotating element of a compressor connected to the motor drive
47
armature
the armature is the winding (or set of windings) of an electric machine which carries alternating current (AC)
48
Cooling Tower
Ans. cross flow and counter flow
49
Commutator
a rotatory electrical switch that reverses the direction of current between the rotor and the external circuit periodically
50
DC Motor
motor is defined as a class of electrical motors that convert direct current electrical energy into mechanical energy
51
Unit of electrical capacitance
Farad abbreviated F (or microfarad, µF)
52
Stuffing box
used to prevent leakage of fluid, such as water or steam
53
Packing gland
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
54
Lantern ring
help protect the stuffing box by allowing flush water or pressure to enter
55
Lock out Tag out a motor
(what do you do with a lockout tag key?)
keep the key yourself
56
Recovery Cylinder
yellow top grey body
57
BTU's required to change liquid to a solid
144
58
Bottoming tap tool ______
doesn't taper
59
A micro turbine will generate
30kw to 60kw
60
Which steam trap has a single movable disc
thermodynamic steam trap
61
Boiler natural draft can be best described as?
No fans, uses the height of the stack
62
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?
250
63
Which feed water regulator uses heat difference in the generator to actuate bellows, which controls the regulating valve?
Thermohydraulic feedwater regulator
(wrong choices are thermoexpansion; Float feedwater; Three element feedwater regulator)
64
Variable air volume (VAV)
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
Multi-zone
A multi-zone HVAC uses one outdoor unit and multiple indoor units
66
Single-zone
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
Variable Refrigerant Flow (VRF)
VRF systems are ductless HVAC systems that use variable motor speeds to send different amounts of refrigeration to multiple evaporators in the system
68
Air Source heat pumps (reversing valve)
A reversing valve is a type of valve and is a component in a heat pump, that changes the direction of refrigerant flow
69
a 100 HP motor is operating at 30Hz. What is the new HP?
(50/100)^3 × 100
0.125 x 100 = 12.5 HP.
70
Diesel oil temperature
165° to 175°
71
Serpentine Belt is connected to
all auxiliary Engines
72
Calculate suction lift of a pump
14.7/ 0.433= 33.91 feet
73
Splash lubrication is achieved by the use of
A splash ring
74
What does NLGI stand for
National Lubricating Grease Institute
75
What type of packing is used in a reaction turbine
Labyrinth Seal
76
NLGI #000 is which type of grease
* 445-475 Penetration
* common application: Gear boxes/ low temperature use
* food equivalent: Ketchup
77
The rotating part of a mechanical seal is
primary sealing ring
78
The Stationary Part of a mechanical seal is
ceramic seal
79
What is a vernier caliper used for
measuring the outside diameter of a bearing
80
What is the best tool to use when removing a bearing from a shaft
(bearing) Puller
81
What is the best device to use when pulling a vacuum on a condenser
A micron gauge
82
How would you measure the speed of a motor
A tachometer
83
What type of tap is used to start tapping a drill hole
taper tap
84
Reverse acting vs Direct acting
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
What is a pyrometer used for
Measuring very high temperatures
86
What is Psychrometer used for
Measuring air humidity
87
You are asked to grease a 10’’ valve. What type of grease fitting will the valve most likely have?
Alemite or Button head
88
How would you start a centrifugal pump, and why this way?
Closed discharge valve, Fill suction side, prime pumps: to lower the starting amperage
89
An oiler notices that a pump discharge is low. If everything is good, RPMs, no leaks, etc. What is the possible problem?
Wearing rings (plates)
90
How many gallons of water in a tank that measures 10x12x10
10x12x10x7.48= 8976 gallons per cubic feet (cubic foot of water=7.48 gallons)
91
Diesel Engine Maintenance or items check
* Timing Belts
* Alternator
* Governor
92
Pump Coupling
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
Fan Damper position based on OA temperatures
* On a hot or cold, less OA
* On a “free cooling day” OA dampers open to maximum
94
What is LEL or UEL
* 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
Where should a confined space permit be placed
At the entrance of the confined space
96
Can the attendant enter a confined space if the entrant needs assistance
NO
97
A pulley should be replaced when showing how much wear when using a pulley gauge
1/16th of an inch
98
Merv 8 filter is considered
a minimum standard for a pre-filter
99
Convert Celcius to Farenheit
F= C (1.8) + 32
100
Convert Farenheit to Celcius
C= (F - 32)(5/9)
101
A motor with a stator, rotor, armature, commutator
DC motor
102
Types of rigging knots
Square knot, clove hitch, double half hitch, inside bowline, sheet bend
103
OSHA regulations for ladders
When a ladder is leaned against the wall, the bottom of the ladder should be <> For access to an elevated work surface, <> or secure the ladder at its top
104
LOTO (lock out tag): Who keeps the Key
The person who placed the LOTO on the device
105
Superheated valves are set to open-
before the main valves
106
Boilers that operate at over 100 psi require
require 2 blowdown valves
107
The flow of combustion gasses over the tubes is controlled by
The baffles
108
The most important valve on a boiler is
safety valve
109
When performing a hydrostatic test on a boiler that has a MAWP of 150 psi, the test pressure should be
225 psi, 1.5 times the MAWP
110
A boiler generating 20,000 lbs of steam per hour must be supplied with at least
20,000lbs of water per hour
111
Oxygen present in boiler water is removed by
Sodium Sulfite
112
The order which zeolite softeners regenerates is
(BBR)
Backwash, Brine, Rinse
113
Impurities on the surface of the boiler water such as grease, scum, and light dissolved solids are removed by
Surface Blow
114
In a refrigeration system a halide torch is used for
Leak detection refrigeration
115
What is the weight of a gallon of water at 62 degrees F
8.33 lbs/gallon
116
An excessive amount of lubricating on a bearing my cause
Overheating/failure
117
A closed water heater is best described as
An Economizer
118
The remote control of the oil burner switch or chiller must be located
Outside each door to the boiler room/chiller plant
119
When determining the acidity or alkalinity of a boiler water, the number 7 on the PH scale means the water is
Neutral
120
The pressure vessel that removes oxygen from the make up feed water entering the boiler is known as a
Deaerator
121
An economizer is used in a steam plant too
Pre-heat feedwater
122
A low pressure steam heating boiler is a boiler operated at a pressure not to exceed
15 psi
123
The pivot point on dampers and linkages should be cleaned and lubricated on a regular basis with
Dry lubricant
124
On which of the following types of pumps has a volute?
Centrifugal
125
In an F and T trap thermostatic element open to discharge
Air and non-condensable gasses
126
When air is compressed by an air compressor it becomes
Hot
127
To eliminate the danger of a furnace explosion during start up, the firing sequence must first allow for
A pre-purge
128
It is noted that the outside surface of an operating evaporator coil for an air conditioning process is wet. This means?
The unit is working properly
129
What is a non return valve and where is it placed
Its a check valve on the main steam header, located closest to the boiler
130
The unloader on an air compressor is used for
Easy start for the motor
131
How would you best describe the operational characteristic of a centrifugal refrigeration machine
A type of dynamic compressor, or turbo compressor with a radial design
132
What do the letters SWP on the side of a valve represent
Steam Working Pressure
133
What do the letters WOG on the side of a valve represent
Water, Oil, Gas
134
A cooling tower will achieve a greater cooling effect on
A dry with low humidity
135
What does “600 SWP” mean when stamped on a valve
Max pressure 600 psi for steam
136
Diesel Engine =
Gasoline Combustion Engine =
= Compression
= Spark Plugs
137
Comfort Cooling
Maintaining the ideal temperature and humidity for human comfort
VAV and VRF are related pretty sure
138
For a clogged Duplex strainer a suction and discharge gauge will appear
In a deeper vacuum
139
What is NPSHA and NPSHR
- 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
MERV
Minimum Efficiency Reporting Value
