Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The evaporator is a device to

  • Keep the compressor busy
  • remove heat from the refrigeration system
  • store liquid refrigerant
  • absorb heat into the refrigeration system

2: What is the minimum height refrigeration piping should be placed against walls?

  • 72"
  • 6'
  • 7.25'
  • Ceiling height

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

  • Over feed
  • Under feed
  • Stay open
  • Close

4: How many CFMs are required per square foot of commercial office occupied space

  • 15 CFM
  • 5 CFM
  • .5 CFM
  • 20 CFM

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

  • RSES
  • EPO
  • DOT
  • EPA

6: What percentage of amperage difference is allowable phase to phase on a HVAC circuit phased to phase?

  • 2%
  • 1%
  • 4%
  • 25%

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

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

8: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • Make sure its compatible, notify owner, and notify AHJ.
  • you can never change refrigerants
  • Nothing must be done
  • Place sign, check for leaks, and insulate suction line

9: What is the leaving chilled water set point for water chiller systems?

  • 38F
  • 45F
  • 66F
  • 55F

10: Refrigerants shall be classified by

  • toxicity and flammability
  • requirements for commercial, industrial, and residential occupancies
  • maximum permissible quantities of each group
  • color codes

11: Brazed joints melt at temperatures above

  • 1,200F
  • 500F
  • 1,000F
  • 800F

12: Methyl Chloride is a halogenated refrigerant and should not come in contact with

  • aluminum
  • zinc
  • magnesium
  • all of the above

13: The measurement of heat in a particular substance is

  • specific heat
  • enthalpy
  • latent heat
  • sensible heat

14: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 500 lbs
  • 330 lbs
  • 660 lbs
  • 55 lbs

15: Evaporators within 18" of a heating coil must be equipped with a

  • high limit control
  • low limit control
  • zone valve
  • pressure relief device

16: Ammonia systems use ____ pressure to adjust oil pressure

  • discharge
  • liquid
  • stream
  • air

17: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?

  • R-113
  • R-22
  • R-11
  • R-12

18: Capacity control on a centrifugal compressor is accomplished by the

  • pre-rotational guide vanes
  • slide vanes
  • check valves
  • post-rotational guide vanes

19: The first step in mechanical refrigeration is

  • condensation
  • expansion
  • compression
  • evaporation

20: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a

  • splurge
  • surge
  • purge
  • merge

21: 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 sweat flanges on the refrigeration piping
  • to release a sticking valve

22: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use rupture discs or duel pressure relief valves
  • shall use pressure relief devices
  • shall use pressure relief devices or fusible plugs
  • shall use fusible plugs

23: Pressure is the equivalent of

  • force per unit area
  • area times force
  • force
  • force times area

24: Ammonia vaporization takes place at what temperature?

  • -110F
  • -28F
  • -460F
  • -32F

25: A micron is

  • one millonths of a micrometer
  • one thousandths of a millimeter
  • one millonths of a centimeter
  • a larger unit of measurement than Hg