Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The critical temperature of a refrigerant gas occurs when

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

2: Usually dry bulb temperature is

  • not important and shall be ignored
  • same as wet bulb temperature
  • lower than dry bulb temperature
  • higher than wet bulb temperature

3: 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

4: The generator shell contains the

  • condenser and the generator
  • condenser, the evaporator, and the generator
  • evaporator and the absorber
  • condenser and the absorber

5: Booster compressors, pump refrigerant into the

  • low side of the primary compressor
  • high side of the secondary compressor
  • receiver
  • heat & plate heat exchanges

6: What section of ASHRAE-15 governs pressure vessels?

  • Section 9 ASHRAE-15 ASME VIII unfired
  • Section 7 ASHRAE-15 ASME VIII fired
  • OSHA
  • Section 6 ASHRAE-34 ASME VIII unfired

7: Where is the high-side float located on a chiller system?

  • liquid line
  • discharge line
  • inside the chiller barrel
  • flash line

8: Systems containing more than 110 pounds must have stop valves located at the

  • compressor suction inlet
  • compressor discharge outlet
  • receiver inlet and outlet
  • All of the above

9: Dew point is

  • the temperature of air of 50% RH
  • the temperature above which water vapor in the air will start to condense
  • the temperature below which water vapor in the air will start to condense
  • the temperature below which water vapor in the air will start to evaporate

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

  • aluminum
  • zinc
  • magnesium
  • all of the above

11: 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

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

12: Horizontal piping should be run level.

  • Yes, if the condenser is located above the evaporator
  • No, unless the supervisor on the job says so.
  • True
  • False

13: What does an anemometer measure?

  • amperage
  • velocity
  • temperature
  • voltage

14: When an A/C system is excessively low on refrigerant

  • it can become contaminated with water
  • there can be nuisance trip outs
  • the suction line may be too hot to touch
  • All of the above

15: What happens after your initial inspection of a pressure vessel?

  • There is a temporary shut-down until a final inspection can be performed.
  • Inspector leaves a metal tag with a certification listed on it
  • Notify the Fire Marshal that the system has been inspected and approved
  • Notify the AHJ to let them know that the system been inspected

16: A relief valve discharge capacity is rated in

  • PSIG
  • PSIA
  • Pounds of air per minute.
  • temperature minus pounds of air per second divided by release rate squared

17: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.

  • True
  • False

18: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When there is a space 6' or more above it
  • When its white
  • When there are sprinklers above
  • When it's used as part of a supply or return air system

19: In an A/C unit, dirty filters will cause

  • high discharge pressure
  • low oil pressure
  • low suction pressure
  • high suction pressur

20: 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

21: The leaving chilled water set point for comfort cooling is typically?

  • 66
  • 45
  • 60
  • 38

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

  • R-22
  • R-11
  • R-113
  • R-12

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

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

24: Halogenated refrigerants cannot be used with what material?

  • Aluminum
  • Stainless steel
  • Copper
  • Magnesium alloy

25: Most CFC's are

  • flammable
  • inert but toxic
  • toxic
  • inert