Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: One atmosphere equals
0 psig
14.7
0 psia
29.4
2: Where is an EPR valve located on a multi-evaporator system?
Suction line of the warmest evaporator
Suction line of the coolest evaporator
Suction line at the compressor
Suction line prior to the accumulator of the lowest temperature system
3: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?
1%
4%
2%
25%
4: What does an anemometer measure?
velocity
amperage
temperature
voltage
5: The most common type of motor starter is
delts-wye starter
duel-winding starter
across the line starter
part winding starter
6: 1 HP = ____ Watts?
3,412
746
11,239
3.1416
7: A restaurant is classified as a
public assembly occupancy
commercial occupancy
large mercantile occupancy
mixed occupancy
8: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
drawing RLA and is running as it should
drawing LRA and is seized and should be replaced.
running hot
none of the above
9: What was the main reason for enacting the no venting rule of July 1, 1992?
Ozone depletion
Green house effect
Global warming potential
All of the above
10: Setting a pressure relief device shall not exceed ___ of the design pressure
75%
100%
80%
90%
11: Copper and its alloys shall not be used with ammonia
True
False
12: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
“UM” and “UV”
“UV”
“U” or “UM”
“UL”
13: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
15
75
55
50
14: Name an HCFC refrigerant(s):
R-22
R-123
R-11
both a & b
15: The generator shell contains the
condenser, the evaporator, and the generator
condenser and the absorber
condenser and the generator
evaporator and the absorber
16: How do you find net oil pressure on a compressor?
discharge pressure - suction pressure
gross oil pressure - suction pressure
gross oil pressure - discharge pressure
all of the above
17: Gauge pressure is
Barometric pressure
Force of pressure above that of atmosphere
Atmospheric pressure
Absolute pressrue
18: The critical temperature of a refrigerant gas occurs when
any increase in pressure will not liquefy the gas
the gas is no longer saturated
the gas returns to a liquid
any decrease in pressure will cause condensation
19: How many volts would you read on a 480V system phase to phase?
480
277
1/3 the voltage
20: On a single phase motor, when does the start winding cut out?
At 50% of its full rated speed
At 75% of its full rated speed
Start windings do no cut-out of the run cycle
At 25% of its full rated speed
21: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
sight glass, weight, pressure, and frost line
sight glass, weight, pressure, and dipstick
Buss-eye, weight, pressure, and frost line
sight glass, weight, paper method, and frost line.
22: The high side float assembly meters refrigerant into the evaporator through the
lower chamber of the high side
upper chamber of the high side
upper chamber of the low side
lower chamber of the low side
23: When can 50/50 solder be used?
in the low side
in the high side
liquid and suction lines
none of the above.
24: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
the owner shall be informed
gas masks must be worn
no flames shall be permitted
explosion precautions must be taken
25: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the