Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

1: What kind of material can't be used on the outlet of a relief valve?

• Copper
• PVC
• Stainless Steel
• Aluminum

2: If a condenser is on a roof and the temperature is 35F and dropping the capacity

• run as designed with low ambient controls
• decreases
• increases
• doesn't change

3: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

• duel-voltage switch
• centrifugal switch
• motor starter
• printed circuit board (PCB)

4: At higher altitudes, boiling temperatures

• are unaffected
• decrease
• depends on the refrigerant
• increase

5: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

• the high side
• 2.5 times the design pressure
• the low side
• the aggregate of the high side and low side

6: A movie theater would be considered a

• mixed occupancy
• commercial occupancy
• institutional occupancy
• public assembly occupancy

7: A moisture indicator must

• change color when exposed to moisture
• be sight side up
• be filled with liquid
• be yellow

8: How many flammability classifications are refrigerants in?

• 3
• 2
• 5
• 7

9: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

• 99%
• 80%
• 75%
• 90%

10: What should never be used in pressure testing refrigeration systems?

• Oxygen
• Compressed air
• Nitrogen
• Both a and b

11: The principle used in continuous type absorption systems is

• Ohm's Law
• Dalton's Law
• Boyle's Law
• Charles's Law

12: What refrigerant were phased out in 2004?

• R-11
• R-22
• R-134a
• R-12

13: R-123 belongs to Group

• A-3
• B-2
• B-1
• B-3

14: Which of the following most closely represents the concentration of Li-Br in a absorption system?

• 60% Li-Br, 40% distilled water
• 50% Li-Br, 50% tap water
• 40% Li-Br, 60% distilled water
• 40% Li-Br, 60% tap water

15: What is the temperature that a liquid and a vapor can exist in equilibrium called?

• Saturated temperature
• Dry bulb temperature
• Wet bulb temperature
• Critical temperature

16: Which creates more of a heat load?

• 50% RH
• 70% RH
• 90% RH
• 30% RH

17: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?

• 15 uf
• 25 uf
• 40 uf
• 20 uf

18: A room having machinery but no flame producing apparatus permanently installed and operated is considered a

• Class M machinery room
• Class T machinery room
• Class A machinery room
• Class B machinery room

19: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the

• cooling temperature set-point
• adjustment of the spring tension of the TXV
• opening at the pump outlet
• opening at the pump inlet

20: What would be the classification for Stop & Shop grocery store?

• Instituional
• Place of assembly
• Large mercantile
• Industrial

21: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

• far apart or greater difference
• nearly the same
• a ling psychrometer doesn't have two theremometers.
• 2F difference

22: A declaration test is needed when the system contains more than

• 120 lbs
• 110 lbs
• 55 lbs
• 65 lbs

23: R-410A can segregate in the system or chemically change its composition due to a leak.

• True
• False

24: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

• Buss-eye, weight, pressure, and frost line
• sight glass, weight, pressure, and frost line
• sight glass, weight, pressure, and dipstick
• sight glass, weight, paper method, and frost line.

25: Direct systems using Group II refrigerants

• shall be allowed to be used for human comfort.
• shall not be used for air condition for human comfort
• shall be installed in Class T machinery rooms
• shall be installed per instruction of the AHJ