Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 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

2: Which of the following is NOT a positive displacement compressor?

  • centrifugal
  • scroll
  • reciprocating
  • screw

3: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 80
  • 90
  • 100
  • 110

4: Ammonia systems use ____ pressure to adjust oil pressure

  • air
  • stream
  • liquid
  • discharge

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

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

6: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?

  • 25 uf
  • 40 uf
  • 15 uf
  • 20 uf

7: When a refrigeration or air conditioning system is installed

  • it shall not be operated below prescribed pressures
  • a field inspection shall be made before it is put into service
  • it shall be approved by the owner for proper operation.
  • the form of certificate shall be authorized by the Department of Pubic safety

8: Laten heat is associated with a change in state of a refrigerant but not temperature

  • True
  • False

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

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

10: When using nitrogen for brazing, the pressure should be:

  • 125 psig
  • 50-100 psig
  • Slightly below atmospheric
  • Very low

11: What does safe access mean?

  • Well-lit exit signs
  • A clear unobstructed path to the equipment and controls
  • Locked doors
  • OSHA approved

12: Gauge pressure is

  • force of pressure above that of atmospheric
  • atmospheric pressure
  • what a gauge reads when checking pressures on a chilled water system.
  • absolute pressure

13: High pressure controls should be set no higher than

  • 10% of set point
  • 90% of set point
  • 25% of set point
  • 80% of set point

14: How much refrigerant can be stored in a mechanical room outside of the system?

  • 330
  • 100
  • 150
  • 200

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

  • 66
  • 45
  • 60
  • 38

16: A High-Probablity system

  • is such that a leak of refrigerant from failed connections will enter the occupied space
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is such that a leak of refrigerant from failed connections will enter the unoccupied space
  • is a system highly likely to leak from a failed connection or component of such system

17: A rule of thumb in air conditioning is ____ CFM per ton?

  • 500
  • 100
  • 600
  • 400

18: While water is evaporated in an evaporative condenser the impurities which were in the water are

  • blown to the atmosphere by the fan
  • washed out of the air by the spray pump
  • accumulate in the sump water
  • remain in the air

19: Thermodynamics is the branch of science that deals with

  • molecular therory
  • state of energy
  • heat energy
  • energy due to motion

20: In an electrical circuit, what is potential measured in?

  • Herys
  • Volts
  • Ohms
  • Amps

21: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?

  • 88
  • 96
  • 58
  • 38

22: "I" represents _______ in the Watt's law formula.

  • reactance
  • watts
  • amperage
  • voltage

23: B3 refrigerants are considered

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

24: A positive displacement compressor is

  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • is a reciprocating type compressor with 2 or more pistons
  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber

25: Trichlorofluoromethane is the name of what refrigerant?

  • R-113
  • R-12
  • R-502
  • R-11