Massachusetts Refrigeration Tech/Contractors practice quiz
Refrigeration RT/RC Prep Quiz
Topics: All categories in the pool
1: Ammonia systems use ____ pressure to adjust oil pressure
liquid
air
discharge
stream
2: The low pressure oil safety switch
must be reset manually
never trips
resets itself automatically
resets itself after the time delay has terminated
3: A start capacitor in series with a start winding will
increase the amp draw of the motor
increase running efficiency
decrease the amp draw of the motor
increase starting torque
4: Halogenated refrigerants cannot be used with what material?
Magnesium alloy
Aluminum
Stainless steel
Copper
5: In an A/C unit, dirty filters will cause
high discharge pressure
high suction pressur
low suction pressure
low oil pressure
6: The certificate of inspection
shall be $20 and an additional fee of $1 for each tone above 20 tons
shall be authorized by a notarized insurance company
shall be posted on the compressor shell or electrical panel at the unit
shall be posted and protected from dirt, water, and other elements
7: What would be the classification of a prison?
Institutional
Place of assembly
Industrial
Large mercantile
8: 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
Buss-eye, weight, pressure, and frost line
sight glass, weight, pressure, and dipstick
sight glass, weight, paper method, and frost line.
9: All machine rooms must be outfitted with a detector that _______?
activates an audible alarm
activates a visual alarm
starts the ventilation system
All of the above
10: The oil separator is always inserted in the system
where it can be easily serviced
in the discharge line
in a cool spot
to prevent oil logging
11: What is the minimum size wire you can use on a 30 amp circuit?
16 AWG
10 AWG
12 AWG
14 AWG
12: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
746 watts
600 watts
1000 watts
5KW
13: A halide torch is most useful with a freon compression system
to detect refrigeration leaks in piping joints
to release a sticking valve
to remove from from TXV's and evaporator coils
to sweat flanges on the refrigeration piping
14: What refrigerant were phased out in 2004?
R-134a
R-22
R-12
R-11
15: NH3 is
R-718
R-508A
ammonia
lithium bromide
16: In an electrical circuit, what is potential measured in?
Amps
Ohms
Volts
Herys
17: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
6.6, 6.6
2.5, 3.0
3.0, 3.5
2.5, 2.5
18: A split-phase motor has a ______ winding and a ____ winding
run, start
run, common
duel-run, duel-start
start, common
19: The critical temperature of a refrigerant gas occurs when
any increase in pressure will not liquefy the gas
the gas returns to a liquid
the gas is no longer saturated
any decrease in pressure will cause condensation
20: What refrigerant has zero ozone depletion
HFC
CFC
HCFC
None of the above
21: A pressure relief should be located at least _______ from windows and doors.
30'
20'
25'
15'
22: A mixed occupancy occurs when two or more occupancies are located with the same building
true
false
23: Heat is a form of
power
work
matter
energy
24: Where is the high-side float located on a chiller system?
inside the chiller barrel
discharge line
liquid line
flash line
25: Liquid level gauges must be provided with what?