Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: "P" represents ______ in the Watt's law formula

  • watts
  • reactance
  • amperage
  • voltage

2: All electrical work done on refrigeration systems must comply with

  • NEC and Massachusetts Modifications
  • OSHA
  • Department of Energy
  • ASHREA-15 Section 9.2.1

3: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to

  • liquid line that is too small
  • shortage of refrigerant
  • liquid line that had too high vertical lift
  • All of the above

4: A positive displacement compressor is

  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
  • is a reciprocating type compressor with 2 or more pistons
  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI

5: Pressure vessels with an internal volume of 3 cubic feet or less

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

6: Gauge pressure is

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

7: Copper and its alloys shall not be used with ammonia

  • True
  • False

8: Ammonia belongs to Group

  • A-1
  • B-1
  • A-2
  • B-2

9: Name a CFC refrigerant(s):

  • R-11
  • R-12
  • R-123
  • both a & b

10: Most CFC's are

  • inert
  • toxic
  • inert but toxic
  • flammable

11: Bubbles in the liquid line sight glass could be caused by

  • bad low pressure switch
  • overcharge of oil
  • leaking discharge valves in the compressor
  • plugged drier

12: A tachometer is an instrument used to measure

  • air velocity
  • RPM
  • static pressure
  • speed

13: R-22 is considered a(n)

  • CFC
  • HFC
  • HCFCH
  • HCFC

14: R-410A is classified as a ____ refrigerant on the safety matrix.

  • A-2
  • B-2
  • A-1
  • B-1

15: Pi equals approximately

  • 3.41
  • 3.14
  • 12,000
  • 746

16: What must be done to refrigerant pipes before being buried?

  • Coated
  • Leaked checked
  • Encased
  • Certified

17: 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

18: Institutional occupancy is

  • a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • None of the above

19: When an inspection is needed, how often must it be done?

  • every 36 months
  • every 18 months
  • annually
  • every 24 months

20: The location of the thermal bulb for the TXV on the evaporator effects

  • both the pressure and temperature in the feeler bulb
  • the amount of superheat required to operate the TXV
  • the amount of liquid in the evaporator
  • the amount of gas in the evaporator

21: Sublimation occurs when

  • gas is formed from a liquid
  • ice melts and turns to water
  • gas is formed directly from a solid
  • liquid is formed from a gas

22: Which has more turns in the windings: Start windings or Run windings?

  • Start windings
  • Run windings
  • They both have the exact same turns
  • Depends on the system and capacitor used

23: What is used to check very low air pressures in air conditioning duct?

  • Vacuum gauge
  • Barometer
  • Anemomter
  • Manometer

24: The critical temperature of a refrigerant gas occurs when

  • any decrease in pressure will cause condensation
  • the gas returns to a liquid
  • the gas is no longer saturated
  • any increase in pressure will not liquefy the gas

25: 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