Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which of the following is not an air velocity meter?

  • Anemotherm
  • Anemometer
  • Hydrometer
  • Velometer

2: Fractionation occurs when

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

3: The discharge relief valve is located (9.4.6)

  • on top of the condensor
  • between the compressor and oil separator
  • between the compressor and the stop valve
  • between the compressor and reciever

4: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by

  • District Engineering Inspectors
  • Commissioned Inspectors
  • Master licensed Technician
  • both a or b

5: Horizontal piping should be run level.

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

6: Bubbles in the liquid line sight glass could be caused by

  • bad low pressure switch
  • overcharge of oil
  • plugged drier
  • leaking discharge valves in the compressor

7: Large mercantile occupancy is

  • a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
  • a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise

8: Fusible plugs shall not be used with pressure vessels of

  • 15 cubic feet or more
  • 3 cubic feet or more
  • 3 cubic feet or less
  • 15 square feet or less

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

  • 1.7
  • .8
  • .1
  • 1.2

10: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UL and UM
  • UM or UL
  • UV or UR
  • UL and UR

11: Heat is a form of

  • power
  • work
  • matter
  • energy

12: A High-Probability System

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

13: How many refrigerant classifications are there for toxicity?

  • 3
  • 1
  • 2
  • 5

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

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

15: What happens to copper joints when overheated?

  • nothing
  • joint becomes oxidized and ditorted
  • copper becomes harder
  • none of the above

16: The normal operating evaporator temperature of R-410A for air conditioning is typically

  • 155F
  • 32F
  • 158F
  • 45F

17: _____ alloys shall not be used in contact with an halogenated refrigerants.

  • Copper
  • Nickel
  • Zinc
  • Magnesium

18: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the high side
  • the aggregate of the high side and low side
  • 2.5 times the design pressure
  • the low side

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

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

20: What does safe access mean?

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

21: 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

22: 1 HP = ____ Watts?

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

23: Where would the EPR valve be located on a multiple evaporator system?

  • inlet of the low temperature evaporator.
  • outlet of low temperature evaporator
  • outlet of the liquid line
  • outlet of high temperature evaporator

24: Whoever owns/uses a refrigeration or air conditioning system covered by this code

  • must notify the Department of Public Safety prior to starting the system
  • shall be licensed by the Commonwealth of Massachusetts according to CMR 522
  • shall make application for inspections to the Chief of Inspectors
  • None of the above

25: Dew point is

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