Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: An air conditioning system rated for 36,000 BTU's is equivalent to

  • three tons of cooling
  • two tons of cooling
  • one ton of cooling
  • 12,000 tons of cooling

2: Which refrigerant is lighter than air?

  • R-11
  • R-134a
  • R-123
  • R-717

3: Where would the EPR valve be located on a multiple evaporator system?

  • outlet of high temperature evaporator
  • inlet of the low temperature evaporator.
  • outlet of low temperature evaporator
  • outlet of the liquid line

4: Clearance volume

  • has no effect on compressor capacity
  • is the same on all compressors
  • affects compressor capacity
  • varies depending on compressor speed

5: Capacity control on a centrifugal compressor is accomplished by the

  • check valves
  • pre-rotational guide vanes
  • post-rotational guide vanes
  • slide vanes

6: Fusible plugs must have what marked on them?

  • Melting temperature in F
  • Melting temperature in C
  • Opening pressure
  • All of the above

7: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

8: The heat picked up in the evaporator must equal to

  • the heat gained by the condenser
  • the heat of compression
  • the heat giving by the condenser
  • the heat lost by the medium being cooled

9: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of

  • the ASME Boiler and Pressure Vessel Code
  • Section 11.3.1.5 ASHRAE 15 Standard
  • the ANSI Standard 10.7.2
  • both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5

10: What kind of system uses two different refrigerants in separate systems dependent on each other?

  • Low pressure
  • R-414B
  • Cascade
  • Simple

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

  • Instituional
  • Industrial
  • Place of assembly
  • Large mercantile

12: On cooling towers, what causes the condenser water to drop

  • tower fans
  • ambient temperatures
  • evaporation of the water droplets
  • sensible heat

13: Refrigerant restricted in 2004 but used for transition for decades:

  • R-134A
  • R-123
  • R-22
  • R-11

14: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is

  • start the comrpessor
  • reset the safety valve
  • start the fan and circulating pump
  • reset the expansion valve

15: The reversing valve is commonly used

  • on multiple compressor systems
  • on all heat pumps
  • on commercial system that involve two different temperatures
  • when the code requires a check valve

16: What is Absolute Zero?

  • -400F
  • -460F
  • -773F
  • -640F

17: Lithium-bromide, Li-Br, is best characterized as a

  • sand
  • sugar
  • soil
  • salt

18: What is specific heat?

  • measured heat
  • heat required to raise the temperature of 1lb of a substance 1 degree
  • the specific heat required to change the state of one cubic foot of air to steam
  • none of the above

19: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • over pressure protection as well as a temperature protection device
  • over pressure protection
  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection and a rupture disc

20: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When there are sprinklers above
  • When there is a space 6' or more above it
  • When it's used as part of a supply or return air system
  • When its white

21: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.

  • True
  • False

22: Where are the three places that the discharge from an ammonia relief valve be piped?

  • To chemical neutralizing tank only
  • Underground, into drain, into mechanical room
  • Atmosphere, Tank containing water, where the AHJ indicates.
  • None of the above.

23: R-717 is

  • ammonia
  • trichloromethane
  • water
  • carbon dioxide

24: 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
  • 2.5, 2.5
  • 3.0, 3.5

25: 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.