Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The difference between saturated liquid and saturated vapor is

  • pressure
  • heat
  • temperature
  • volume

2: R-22 falls under which safety classification?

  • A-1
  • B-2
  • A-2
  • B-1

3: The normal operating evaporator temperature of R-410A for air conditioning is typically

  • 155F
  • 32F
  • 158F
  • 45F

4: Large mercantile occupancy is

  • a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
  • a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise

5: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

6: Foaming of oil in a compressor is most likely to occur

  • when the evaporator temperatures are below 32F
  • at start-up
  • when ambient temperature are low
  • when there is insufficient air across the condenser(i.e., dirty coil)

7: The discharge relief valve is located (9.4.6)

  • on top of the condensor
  • between the compressor and oil separator
  • between the compressor and the stop valve
  • between the compressor and reciever

8: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?

  • Because it's cheap
  • R-718 is not rated unlimited because it's a dangerous refrigerant
  • Because it's a non-flammable refrigerant
  • Because it's water

9: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 660 lbs
  • 55 lbs
  • 550 lbs
  • 330 lbs.

10: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.

  • 50
  • 75
  • 24
  • 100

11: _____ alloys shall not be used in contact with an halogenated refrigerants.

  • Copper
  • Nickel
  • Zinc
  • Magnesium

12: How many square inches per square foot?

  • 144
  • 64
  • 98
  • 24

13: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • specific heat
  • lost heat
  • latent heat
  • sensible heat

14: 1 Watt = ______ BTU's?

  • 3.412
  • 7.216
  • 4.482
  • 12

15: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 2.2
  • 1.2
  • 1
  • 1.5

16: What is the voltage of each leg of a 480 Volt three-phase motor?

  • 240v
  • 208v
  • 120v
  • 277v

17: What is not a requirement of a Class T machine room?

  • Automatic ventilation
  • Self-closing doors
  • Fire hose connected to the building fire protection system.
  • Tight fitting doors

18: When must refrigeration system covered by the code be inspected?

  • Not required
  • Annually and when installed
  • Upon installation
  • Annually

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

  • Stainless steel
  • Magnesium alloy
  • PVC
  • Copper

20: What is an example of institutional occupancy?

  • Hospital
  • Dorms
  • Shopping mall
  • Football stadium

21: Methyl Chloride is a halogenated refrigerant and should not come in contact with

  • aluminum
  • zinc
  • magnesium
  • all of the above

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

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

23: The high side float assembly meters refrigerant into the evaporator through the

  • lower chamber of the low side
  • upper chamber of the high side
  • lower chamber of the high side
  • upper chamber of the low side

24: The Board of Boilers adopts by reference

  • the MACS Pressure Vessel Code of Massachusetts
  • the 1997 ANSI/ASHRAE Safety Code
  • Montreal Protocol Safety Code
  • MSCA Code

25: On a single phase motor, when does the start winding cut out?

  • At 75% of its full rated speed
  • At 50% of its full rated speed
  • At 25% of its full rated speed
  • Start windings do no cut-out of the run cycle