Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The measurement of heat in a particular substance is

  • enthalpy
  • specific heat
  • sensible heat
  • latent heat

2: Capacity control on an absorption system is typically accomplished by varying the

  • pressure setting on the system's rupture disc
  • rate at which heat is supplied to the generator
  • speed of the chilled water circulatory pump
  • speed of the condenser water circulator pump

3: Which refrigerant replaced R-12?

  • R-22
  • R-407A
  • R-410A
  • R-134A

4: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?

  • refrigerant sensing
  • phosgene gas sening
  • A group sensing
  • CO Sensing

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

  • 11F
  • 9F
  • 21F
  • 29F

6: What will occur if the strong solution in an absorption chiller becomes too strong?

  • The machine will cool excessively as the solution crystallizes.
  • The machine will stop cooling and the solution will evaporate.
  • The machine will stop cooling and solution will crystallize
  • The machine will cool excessively as the solution evaporates

7: Megaohm meter's main function is

  • to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
  • to detect very high resistances to ground of refrigeration or air conditioning compressors
  • to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
  • Both a and b are correct

8: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

9: R-11 belongs to Group

  • A-2
  • A-1
  • B-1
  • B-3

10: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a

  • splurge
  • surge
  • merge
  • purge

11: What is the minimum size of the discharge pipe?

  • Same size as the outlet of the relief valve
  • One pipe size larger that the inlet of the relief valve
  • Depends on size of manifold
  • All of the above

12: Whoever owns/uses a refrigeration or air conditioning system covered by this code

  • must notify the Department of Public Safety prior to starting the system
  • shall be licensed by the Commonwealth of Massachusetts according to CMR 522
  • shall make application for inspections to the Chief of Inspectors
  • None of the above

13: The location of a thermal bulb of a TXV affects

  • the amount of liquid in the condenser.
  • the amount of liquid refrigerant in the evaporator
  • subcooling
  • the amount of liquid returning to the compressor

14: 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
  • 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

15: Which of the following are considered inorganic refrigerants?

  • R-717 and R-718
  • 410A and R-407C
  • R-500 and R-502
  • None of the above

16: The first step in mechanical refrigeration is

  • compression
  • condensation
  • expansion
  • evaporation

17: Humidity can be sensed with

  • human hair
  • bimetal
  • thermometer
  • pressure bellows

18: Pressure vessels with an internal volume of 3 cubic feet or more

  • shall use fusible plugs
  • shall use pressure relief devices
  • shall use pressure relief devices or fusible plugs
  • do not need pressure relief protection

19: How many volts would you read on a 480V system phase to phase?

  • 0
  • 480
  • 1/3 the voltage
  • 277

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

  • atmosphere, tank containing water, where the A.H.J. indicates
  • underground, into drain, into mechanical room
  • to chemical neutralizing tank only
  • none of the above

21: Low pressure chiller systems use what type of compressor?

  • Centrifugal
  • Scroll
  • Reciprocating
  • Screw

22: What refrigerant is an inorganic compound?

  • R-132A
  • Ammonia
  • R-410A
  • R-22

23: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?

  • 96
  • 38
  • 88
  • 58

24: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

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

25: Heat transferred by conduction from one body to another is done via:

  • gas
  • liquid
  • solid
  • All of the above