Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: One atmosphere equals

  • 29.4
  • 0 psig
  • 0 psia
  • 14.7

2: A mercury bulb controller is not recommended for

  • line voltage use
  • use where vibration is severe
  • line or low voltage use
  • low voltage use

3: 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
  • 3.0, 3.5
  • 2.5, 3.0
  • 2.5, 2.5

4: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Saturated temperature
  • Dry bulb temperature
  • Critical temperature
  • Wet bulb temperature

5: 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

6: 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

7: Gauge pressure is

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

8: What is Absolute Zero?

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

9: What device measures the specific gravity of a substance?

  • Thermometer
  • Hydrometer
  • Manometer
  • Hygrometer

10: The gauge thickness required on a CO2 tank construction is

  • 1/16"
  • 1/8"
  • 3/32"
  • 5/16"

11: The most common type of motor starter is

  • delts-wye starter
  • across the line starter
  • duel-winding starter
  • part winding starter

12: In an electrical circuit, what is potential measured in?

  • Amps
  • Ohms
  • Volts
  • Herys

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

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

14: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • shall have a pressure limiting device installed on the high side of the system
  • shall be inspected by the Boiler of Inspectors bi-annually
  • does not require a pressure-limiting device
  • shall have a pressure limiting device and a pressure relief valve installed

15: A class B2 refrigerant is considered

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

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

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

17: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.

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

18: A 24 volt transformer with a 240 volt primary can handle how many amps?

  • There isn't enough information to answer.
  • 20 amps
  • 10 amps
  • 24 amps

19: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 1.5
  • 2.2
  • 1
  • 1.2

20: 746 watts is equal to

  • 10 hp
  • 1 hp
  • 100 hp
  • Pi

21: How do you find net oil pressure on a compressor?

  • discharge pressure - suction pressure
  • gross oil pressure - suction pressure
  • gross oil pressure - discharge pressure
  • all of the above

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

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

23: How many different groups of refrigerants are there?

  • 15
  • 11
  • 3
  • 7

24: How many opening forces operate a thermostatic expansion valve?

  • 4
  • 2
  • 1
  • 3

25: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a

  • public assembly occupancy.
  • commercial occupancy
  • business occupancy
  • mercantile occupancy