Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The low pressure oil safety switch

  • must be reset manually
  • never trips
  • resets itself after the time delay has terminated
  • resets itself automatically

2: The color code of a tank of ammonia is

  • white
  • light green
  • lavender
  • silver

3: What is a Category "D" fluid?

  • A typical refrigerant used on newer air conditioning and heat pump ssytems
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
  • Any fluid that exceeds 150 psig and has design temperature of over 366F

4: What happens to copper joints when overheated?

  • nothing
  • joint becomes oxidized and ditorted
  • copper becomes harder
  • none of the above

5: What instrument is used to measure very high resistance?

  • voltmeter
  • meg ohmmeter
  • ammeter
  • tape measure

6: Pressure vessels with an internal volume of 3 cubic feet or more

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

7: On an air cooled condenser, if the ambient air is 35F and dropping, what's its effect to the condensor?

  • it would make the condenser more efficient
  • it would make the condenser less efficient
  • it would cause the condenser to sweat
  • it would have no effect on the condenser

8: 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

9: What is not a requirement of a Class T machine room?

  • Fire hose connected to the building fire protection system.
  • Automatic ventilation
  • Tight fitting doors
  • Self-closing doors

10: Gauge pressure is

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

11: An electronic bridge circuit is basically a

  • Wheatstone
  • high voltage circuit
  • 24 volt control circuit
  • suspension

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

  • 100
  • 600
  • 400
  • 500

13: The critical temperature of a refrigerant gas occurs when

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

14: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?

  • 970 BTU
  • 144 BTU
  • 24,000 BTU
  • 12,000 BTU

15: A halide torch is most useful with a freon compression system

  • to detect refrigeration leaks in piping joints
  • to remove from from TXV's and evaporator coils
  • to release a sticking valve
  • to sweat flanges on the refrigeration piping

16: R-12 is

  • trichlorofluoromethane
  • dichloromethane
  • dichlorodifluoromethane
  • dichlorofluoromethane

17: What must be done to refrigerant pipes before being buried ?(8.10.4)

  • Leak checked
  • Certified
  • Classifed
  • Insulated and installed in a pipe duct (Encased)

18: The Department that certifies the transportation of refrigerant is the

  • DOT
  • EPO
  • RSES
  • EPA

19: What do you need to do when you install a new system?

  • Document the superheat and subcooling reading
  • Insulate the suction line before you take a superheat reading
  • Add refrigerant
  • Have it inspected

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

  • Reciprocating
  • Scroll
  • Centrifugal
  • Rotary

21: In an air conditioning system, the unit of total heat energy content in an air/vapor mixture is

  • Latent heat
  • Specific heat
  • Enthalpy
  • Sensible heat

22: If the power element on an expansion valve should lose its charge, the valve would

  • Close
  • Under feed
  • Over feed
  • Stay open

23: How many refrigerant classifications are there for toxicity?

  • 3
  • 1
  • 2
  • 5

24: 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

25: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

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