Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A class B2 refrigerant is considered

  • toxic and non-flammable
  • non-toxic and highly flammable
  • non-toxic and non-flammable
  • toxic and somewhat flammable

2: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)

  • commercial occupancy
  • public assembly occupancy
  • institutional occupancy
  • illegal occupancy

3: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the

  • low side of the system
  • high side float assembly
  • cap tube
  • none of the above

4: Suction valve unloaders afford an effective means of

  • capacity control
  • evaporator control
  • refrigerant control
  • superheat control

5: What is absolute humidity?

  • the amount of moisture in the air per one pound of 50% RH air
  • the amount of moisture in the air in grains of cubic feet of volume
  • the amount of moisture in the air in grains of square feet of volume
  • none of the above

6: one BTU equals

  • 3.41 hp
  • 12,000 hp
  • Pi
  • 31.4 hp

7: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

8: On a pumpdown system, the liquid-line solenoid is controlled by the

  • low pressure switch
  • thermostat
  • defrost timer
  • low-ambient controller

9: A movie theater would be considered a

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

10: Which oil is hydoscopic?

  • mineral
  • animal
  • SW30
  • polyolester

11: Ammonia systems use ____ pressure to adjust oil pressure

  • liquid
  • air
  • discharge
  • stream

12: Gauge pressure is

  • force of pressure above that of atmospheric
  • atmospheric pressure
  • absolute pressure
  • what a gauge reads when checking pressures on a chilled water system.

13: Control systems can be classified by

  • tonnage of system
  • safety
  • economy of operation
  • source of power

14: When energized, a normally open relay will be

  • noisy
  • depends on the type and class of the relay
  • closed
  • open

15: A motor starter is a device that includes an overload and a _______?

  • contactor
  • 2-pole contacts
  • duel-coil
  • all of the above

16: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be

  • 50.2 psig
  • 66.1 psig
  • 70.8 psig
  • 43.3 psig

17: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

18: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to

  • hold up to 110% of the pumpdown charge
  • release the charge when the pressure exceeds 310 psig or higher
  • Pumpdown procedures are not allowed with systems containing liquid recievers
  • receive the pumpdown charge

19: How many groups of refrigerants are there?

  • 1
  • 5
  • 3
  • 7

20: The best way to detect ammonia in brine is

  • CO2 gas
  • potassium of line
  • carbonation of soda
  • nessler regaent

21: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

  • lower
  • there is no Group B1 refrigerants
  • the same
  • higher

22: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?

  • fusible plug
  • relief valve
  • rupture disc
  • all of the above

23: A machine room with a refrigerant system using ammonia shall

  • be provided with a continuously operated ventilation system
  • be considered a non-hazardous location in accordance with National Electrical code
  • have no flame producing apparatus permanently installed and operated
  • All of the above

24: If the suction pressure is low and the evaporator temperature high, the cause will be a?

  • too small evaporator
  • compressor suction valve stuck open
  • starved evaporator
  • overcharged

25: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use pressure relief devices or fusible plugs
  • shall use fusible plugs
  • shall use rupture discs or duel pressure relief valves
  • shall use pressure relief devices