Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: 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

3: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 100%
  • 75%
  • 80%
  • 90%

4: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.

  • low pressure
  • design pressure
  • critical pressure
  • high pressure

5: Three-phase motors have what type of windings?

  • one start winding and one run winding.
  • three run windings and 3 start windings
  • three run windings
  • three start windings

6: What is an example of institutional occupancy?

  • Hospital
  • Shopping mall
  • Dorms
  • Football stadium

7: The Board of Boilers adopts by reference

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

8: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.

  • 2.5
  • 1250
  • There isn't enough information to answer.
  • 2

9: Defined process piping by code CMR (528)

  • Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
  • Any piping in an industrial space
  • Any piping in an industrial or commercial space
  • All of the above

10: What is R-22?

  • Chlorofluoromethane
  • CCFCM
  • Chlorodifluoromethane
  • HFC

11: 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

12: R-123 belongs to Group

  • B-1
  • B-2
  • B-3
  • A-3

13: 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

14: When is the only time you can leave a service container attached to a system?

  • Leaking system
  • Recovery
  • Charging
  • Both b and c

15: The boiling point of a refrigerant is based on

  • Temperature
  • Heat content
  • a pressure-temperature relationship
  • None of the above.

16: The equivalent length of pipe in a water piping system is

  • the total length of pipe plus equivalent-length of fittings
  • the total length of pipe plus equivalent of fittings multiplied by 2.31
  • the total length of pipe as you would measure it plus 25% for fittigns
  • the total length of pipe as you would measure it

17: The principle used in continuous type absorption systems is

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

18: 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

19: Which occupancy can ammonia be used in?

  • industrial
  • commercial
  • redifential
  • depends on the quantity of freon

20: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • compressor
  • boiler
  • outside the machinery room
  • evaporator

21: Direct systems using Group II refrigerants

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

22: What refrigerant doesn't have to be classified?

  • R-422A
  • R-717
  • R-134A
  • R-718

23: How many different groups of refrigerants are there?

  • 7
  • 3
  • 15
  • 11

24: How far from the ground does a relief valve need to be?

  • At least 25' above grade
  • At least 15' above grade
  • At least 20' above grade
  • Not more than 3' above grade

25: The first step in mechanical refrigeration is

  • compression
  • condensation
  • expansion
  • evaporation