Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

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

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

3: High side floats are used on centrifugal chiller systems are are considered critically charged systems.

  • are obsolete.
  • False
  • depends on the type of refrigerant being used
  • True

4: The instrument used to measure the specific gravity of absorption chiller solutions is the

  • hydrometer
  • anemometer
  • refractometer
  • Psychrometer

5: 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

6: On a single phase motor, when does the start winding cut out?

  • 100% of its RLA speed
  • 50% of its RLA speed
  • 25% of its RLA speed
  • 75% of its RLA speed

7: What is the boiling point of refrigerant governed by?

  • Compressor RPM's
  • P&T relationship
  • Evaporator temperature
  • Condenser sub-cooling

8: The formula for Pure Power in a resistance circuit is

  • Watts = volts X amps
  • Watts X power factor
  • Kw = volts X amps
  • Watts X amps.

9: What are the three components of a transformer?

  • Contacts, secondary coil, and core
  • Primary coil, secondary coil, and core
  • Primary core, secondary coil, and high and low voltage connectors.
  • Primary coil, secondary coil, and copper contacts

10: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

11: "R" represents ___ in the Ohm's law formula

  • resistance
  • capacitance
  • amperage
  • voltage

12: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.

  • 75
  • 100
  • 50
  • 24

13: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?

  • fusible plug
  • relief valve
  • rupture disc
  • all of the above

14: On cooling towers, what causes the condenser water to drop

  • tower fans
  • sensible heat
  • evaporation of the water droplets
  • ambient temperatures

15: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

16: 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

17: Who approves containers for refrigerants?

  • D.O.T
  • D.O.E
  • E.P.A
  • D.O.D

18: R-22 falls under which safety classification?

  • B-2
  • B-1
  • A-2
  • A-1

19: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be

  • 66.1 psig
  • 43.3 psig
  • 50.2 psig
  • 70.8 psig

20: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, pressure, and dipstick
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, pressure, and frost line
  • sight glass, weight, paper method, and frost line.

21: 1 HP = ____ Watts?

  • 746
  • 3.1416
  • 11,239
  • 3,412

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

  • 2%
  • 1%
  • 25%
  • 4%

23: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

24: Refrigerants shall be classified by

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

25: Increasing superheat will do what to your system?

  • Nothing
  • Increase liquid flow
  • Increase gas flow
  • Decrease liquid flow