Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is a high-side float?

  • Located in the liquid line entering the evaporator, so when the refrigerant level is higher in the liquid line than the evaporator, the float rises to allow more refrigerant flow into the evaporator
  • An electronic-type metering device that contains a float assembly within the device which can accurately meter refrigerant into the evaporator as the load varies
  • Located in the liquid line entering the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the high side of the chiller
  • Located in the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the low side of the chiller

2: R-11 has the greatest corrosive effect on

  • Bronze
  • Magnesium
  • Copper
  • Aluminum

3: 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

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

  • 38F
  • 55F
  • 45F
  • 66F

5: R-123 belongs to Group

  • B-1
  • A-3
  • B-3
  • B-2

6: What effect does the temperature of air have on humidity?

  • warmer air holds more moisture then cooler air
  • cooler air holds more moisture then warmer air
  • air has no effect of humidity
  • none of the above

7: Which is the lowest vacuum?

  • 1,000 Microns
  • 5" hg
  • 10 psia
  • 5 psig

8: Class T machine room

  • shall have refrigerant leak detecting systems installed inside and outside the room
  • shall have remote controls to stop the action of the refrigerant compressor
  • has no flame producing apparatus permanently installed
  • shall include closets used for setting equipment

9: What pipe can not be used for refrigeration?

  • L
  • M
  • N
  • K

10: Name a CFC refrigerant(s):

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

11: What type of voltage causes the winding in a potential relay to open?

  • BEMF (Back Electro-Motive Force)
  • 24V control voltage from the thermostat
  • 120V line voltage
  • None of the above

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

  • 1.7
  • .1
  • .8
  • 1.2

13: A EPR valve is installed on what type of evaporators?

  • shell and tube evaporators
  • low-temperature evaporators
  • plate evaporators
  • high-temperature evaporators

14: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?

  • A group sensing
  • phosgene gas sening
  • refrigerant sensing
  • CO Sensing

15: What is considered a cooling agent?

  • any liquid used for the transmission of heat when condensation occur
  • any liquid used for the transmission of heat without vaporization
  • any liquid used for the transmission of heat without condensation
  • any liquid used for the transmission of heat when vaporization occurs

16: Doors communicating with outside from a mechanical room must be?

  • Self-closing, approved, fire door
  • Steel, approved, weather-stripped
  • Self-closing, wooden, fire door
  • Self-closing, aligned, fire door

17: A split-phase motor has a ______ winding and a ____ winding

  • start, common
  • run, common
  • run, start
  • duel-run, duel-start

18: How many forces operate a thermostatic expansion valve?

  • 1
  • 4
  • 2
  • 3

19: How would you know if there was a loss of crankcase pressure?

  • oil will thin out
  • oil level will rise
  • oil will thicken
  • oil will foam

20: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.

  • 15
  • 75
  • 55
  • 50

21: Fractionation occurs when

  • the pressures increase as the heat load increases
  • when a fraction of refrigerant is added as the full charge
  • the pressures decreases as the heat load decreases
  • some of the blended refrigerant evaporates or condenses before the rest of the blend

22: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?

  • checking the level of refrigerant in the system
  • testing for oil in the system
  • testing for moisture in the system
  • none of the above

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

  • 660 lbs
  • 550 lbs
  • 55 lbs
  • 330 lbs.

24: Atmospheric pressure is equal to

  • 29.92" Hg
  • 14.7 psia
  • 14.7 psig
  • both a & b

25: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Adiabatic
  • Pressure Temperature
  • Volume Temperature
  • Isothermal