Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is

  • 9F
  • 21F
  • 29F
  • 11F

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

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

3: Dual-pressure relief devices should be installed on

  • vessels of 10 cubic feet or more
  • vessels of 3 cubic feet or less
  • vessels of 3 cubic feet or more
  • vessels of 10 cubic feet or less

4: The discharge relief valve is located (9.4.6)

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

5: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

6: 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

7: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

8: Megaohm meters can detect a ground in the

  • up to 1,000 ohms
  • 10,000,000 ohms or higher
  • up to 10,000 ohms
  • up to 1,000,000 ohms

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

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

10: A start capacitor is wired in _____ with the start windings.

  • series
  • junction
  • series-parallel
  • parallel

11: Which oil is hydoscopic?

  • mineral
  • animal
  • SW30
  • polyolester

12: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig

  • 327 psig
  • 365 psig
  • 255 psig
  • 125 psig

13: Color is important in oil because

  • it indicates the viscoisty.
  • can tell us something about the refining of oil
  • allows you to see into crankcase
  • it makes sight glasses easy to read

14: Pressure is the equivalent of

  • area times force
  • force
  • force per unit area
  • force times area

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

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

16: Volts x amps equals

  • Watts
  • Ohms Law
  • Impedance
  • Inductance

17: The measurement of heat in a particular substance is

  • sensible heat
  • enthalpy
  • latent heat
  • specific heat

18: Halogen refrigerants are corrosive to which type of metal?

  • black iron
  • copper
  • stainless steel
  • magnesium

19: 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.

20: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 44 lbs
  • 22 lbs
  • 13.9 lbs
  • 6.6 lbs

21: A hotel is considered a _______ occupancy.

  • residential
  • institutional
  • commercial
  • mercantile

22: What device should be used on low-temperature freezers?

  • oil separator
  • high capacity TXV
  • discharge muffler
  • hot-gas by-pass

23: Give an example of a secondary coolant?

  • R-717
  • R-12
  • R-410A
  • R-718

24: 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

25: The color code of a tank of ammonia is

  • white
  • light green
  • lavender
  • silver