Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: A check valve is a device

  • designed to allow the flow of refrigerant gas in both directions
  • that is always spring loaded
  • with a pressure drop
  • found on high pressure steam systems

2: The two float-type metering devices are the

  • high-side float and the low-side float
  • vapor float and the low-side float.
  • liquid float and the vapor float
  • liquid float and the low-side float

3: A water regulating valve opens when

  • the compressor is on
  • when the power is on there is an overcharge of refrigerant
  • the head pressure rises
  • when the power is on

4: A class B1 refrigerant is considered

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

5: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UL and UR
  • UL and UM
  • UV or UR
  • UM or UL

6: There can be no airflow from an occupied space through a machine room unless what?

  • System is high velocity
  • System is ducted and sealed
  • Duct is not located in the ceiling
  • None of the above.

7: The actual expansion curve of compressor follows most nearly which one of the following

  • Pressure-Temperature
  • Adiabatic
  • Volume
  • Isothermal

8: _____ and its alloys are suitable for use with ammonia systems.

  • Aluminum
  • Copper
  • Zinc
  • Magnesium

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

  • Centrifugal
  • Reciprocating
  • Scroll
  • Rotary

10: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 22 lbs
  • 6.6 lbs
  • 13.9 lbs
  • 44 lbs

11: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the

  • adjustment of the spring tension of the TXV
  • cooling temperature set-point
  • opening at the pump inlet
  • opening at the pump outlet

12: A thermometer inside a duct measures ____ heat.

  • specific
  • latent
  • sensible
  • hidden

13: 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

14: Each machinery room shall contain

  • smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
  • a refrigerant detector located in an area where the refrigerant from a leak will concentrate
  • high and low pressure controls
  • a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate

15: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • specific heat
  • lost heat
  • sensible heat
  • latent heat

16: What would be the classification of a prison?

  • Large mercantile
  • Institutional
  • Place of assembly
  • Industrial

17: What is NOT a positive displacement compressor.

  • Scroll
  • Reciprocating
  • Rotary
  • Centrifugal

18: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is

  • 1.2
  • .8
  • .1
  • 1.7

19: Which of the following types of oils are hygroscopic?

  • polyolester (POE)
  • polyalkylene glycol (PAG)
  • naphthene mineral
  • both a and b

20: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?

  • 5/8"
  • 1/2"
  • 3/8"
  • 3/4"

21: Halogen refrigerants are corrosive to which type of metal?

  • copper
  • stainless steel
  • black iron
  • magnesium

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

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

23: Joints in refrigeration piping must be _____ before being covered?

  • Inspected
  • Pressurized
  • Leak tested
  • Insulated

24: When energized, a normally open relay will be

  • noisy
  • depends on the type and class of the relay
  • open
  • closed

25: When air is ducted through a machine room that services occupied space, What must be done?

  • Flanged and gasketed
  • Insulated and cross broke
  • Welded and seamed.
  • Ducted and sealed