Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What refrigerant were phased out in 2004?

  • R-12
  • R-22
  • R-11
  • R-134a

2: Fusible plugs must have what marked on them?

  • Melting temperature in F
  • Melting temperature in C
  • Opening pressure
  • All of the above

3: A rule of thumb in air conditioning is ____ CFM per ton?

  • 100
  • 400
  • 600
  • 500

4: Laten heat is associated with a change in state of a refrigerant but not temperature

  • True
  • False

5: 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

6: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False

7: A cross charged power element on an expansion valve would normally be used in what temperature range?

  • 0F-38F
  • 30F to 50F
  • -100F to -40F
  • -40F to 0F

8: 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

9: A device used to measure small pressure differences is the

  • anemometer
  • phsycometirc
  • pyrometer
  • manometer

10: All low-pressure chillers use which type of compressor?

  • Reciprocating
  • Scroll
  • Rotary
  • Centrifugal

11: Foaming of oil in a compressor is most likely to occur

  • when the evaporator temperatures are below 32F
  • at start-up
  • when ambient temperature are low
  • when there is insufficient air across the condenser(i.e., dirty coil)

12: Name a CFC refrigerant(s):

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

13: The high side float assembly meters refrigerant into the evaporator through the

  • upper chamber of the high side
  • upper chamber of the low side
  • lower chamber of the high side
  • lower chamber of the low side

14: Low ambient controls are used when

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

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

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

16: Watt's Law indicates Volts X Amps = _________.

  • Ohms
  • Watts
  • Current
  • Resistance

17: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

18: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • lift voltage
  • boost voltage
  • pick-up voltage
  • run voltage

19: The critical temperature of a refrigerant gas occurs when

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

20: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

21: Cooling tower lowers condenser water temp by

  • condensation
  • evaporative cooling
  • running water thru a secondary heat exchanger
  • running fans at 100%

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

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

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

  • booster
  • single stage
  • cascade
  • indirect

24: The best way to determine the voltage requirement for an electrical component is to

  • read the nameplate data
  • read the voltage with a mulitmeter
  • check with the utility company
  • determine the capacity of the service panel

25: Class 3 refrigerants are

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