Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Ammonia is under what safety classification?

  • B3
  • A3
  • B2
  • B1

2: A tachometer is an instrument used to measure

  • RPM
  • air velocity
  • speed
  • static pressure

3: R-410A can segregate in the system or chemically change its composition due to a leak.

  • True
  • False

4: Gauge pressure is

  • Force of pressure above that of atmosphere
  • Barometric pressure
  • Atmospheric pressure
  • Absolute pressrue

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

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

6: All serviceable components of a refrigeration system shall be provided with

  • manufactures instructions on start-up procedures
  • name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
  • service manuals
  • safe access

7: How are a compressor and condenser fan wired?

  • parallel
  • series-parallel
  • parallel-series
  • series

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

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

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

  • Barometer
  • Vacuum gauge
  • Anemomter
  • Manometer

10: Two systems using separate refrigerants that are superimposed upon one another is called

  • cascade
  • single stage
  • booster
  • indirect

11: Class A refrigerants are considered

  • toxic
  • non-flammable
  • non-toxic
  • flammable

12: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?

  • 10,000
  • 100,000
  • 1,000
  • 100

13: Most CFC's are

  • inert but toxic
  • toxic
  • flammable
  • inert

14: Low pressure systems have what kind of compressor?

  • Reciprocating
  • Rotary
  • Scroll
  • Centrifugal

15: Low ambient controls are used when

  • on air conditioning systems only
  • economizers are used
  • always
  • when systems run all year round

16: Mercury was used in thermometers primarily because it

  • was inexpensive
  • expands uniformly
  • never freezes
  • vaporizes at very high temperatures

17: If a low-pressure chiller has a low-side leak, which of the following will most likely result?

  • High suction pressure and high discharge pressure.
  • Low head pressure and high suction pressure
  • Low suction pressure and low discharge pressure
  • High head pressure and low suction pressure

18: Dual-pressure relief devices should be installed on

  • vessels of 10 cubic feet or more
  • vessels of 10 cubic feet or less
  • vessels of 3 cubic feet or less
  • vessels of 3 cubic feet or more

19: Trichlorofluoromethane is the name of what refrigerant?

  • R-11
  • R-12
  • R-502
  • R-113

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

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

21: Sublimation occurs when

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

22: 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?

  • 88
  • 96
  • 38
  • 58

23: The boiling point of a refrigerant is based on

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

24: Oils, classified as to source, are

  • naphthalene, mixed, and paraffin
  • animal, vegetable, and castor
  • animal, vegetable, and mineral
  • naphthalene, paraffin, and castor

25: A VRF system is a direct system

  • true
  • false