Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is R-22?

  • Chlorofluoromethane
  • HFC
  • CCFCM
  • Chlorodifluoromethane

2: Pressure vessels of 10 cubic feet or more gross volume shall use

  • at least one rupture member
  • a dual pressure-relief valve if charging into the atmosphere
  • at least three means of discharge and/or rupture discs
  • both a and b are correct

3: Pipe identification labels are required when the system contains more than

  • 55 lbs
  • 65 lbs
  • 120 lbs
  • 110 lbs

4: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • “UV”
  • “UL”
  • “UM” and “UV”
  • “U” or “UM”

5: What must be done to refrigerant pipes before being buried ?(8.10.4)

  • Leak checked
  • Classifed
  • Certified
  • Insulated and installed in a pipe duct (Encased)

6: Volts x amps equals

  • Ohms Law
  • Watts
  • Impedance
  • Inductance

7: Gauge pressure is

  • Force of pressure above that of atmosphere
  • Atmospheric pressure
  • Barometric pressure
  • Absolute pressrue

8: Suction line oil traps should be installed when the condenser is

  • on the third floor roof and the evaporator is in the basement
  • in the basement and the evaporator is on the third floor
  • located outside the operates in temperatures below 35F
  • more than 100' away from the evaporator

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

10: How do you find net oil pressure on a compressor?

  • discharge pressure - suction pressure
  • gross oil pressure - suction pressure
  • gross oil pressure - discharge pressure
  • all of the above

11: What are the three components of a transformer?

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

12: On a large centrifugal system, what meters the flow to the evaporator?

  • Cap tube.
  • TXV
  • High side float
  • Low side float

13: Megaohm meter's main function is

  • to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
  • to detect very high resistances to ground of refrigeration or air conditioning compressors
  • to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
  • Both a and b are correct

14: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a

  • splurge
  • merge
  • purge
  • surge

15: When a refrigerating machinery room is used, the emergency procedures shall be posted

  • inside the room, immediately adjacent to each door
  • outside the room, immediately adjacent to each door
  • on a conspicuous card located near the compressor
  • on a conspicuous card located near the evaporator

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

  • True
  • False

17: How many square inches per square foot?

  • 144
  • 64
  • 24
  • 98

18: How many gallons of water per pound of ammonia do you need?

  • 20
  • 15
  • 5
  • 1

19: Fractionation occurs when

  • the pressures decreases as the heat load decreases
  • the pressures increase as the heat load increases
  • 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

20: How are safety controls wired in a circuit?

  • Either series or parallel
  • Series/parallel
  • Series
  • Parallel

21: It takes how many BTU/hr to melt one pound of ice at 32F

  • 970
  • 180
  • 212
  • 144

22: one BTU equals

  • 31.4 hp
  • 3.41 hp
  • Pi
  • 12,000 hp

23: The oil separator is always inserted in the system

  • in a cool spot
  • in the discharge line
  • to prevent oil logging
  • where it can be easily serviced

24: If a condenser is on a roof and the temperature is 35F and dropping the capacity

  • decreases
  • run as designed with low ambient controls
  • doesn't change
  • increases

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

  • 38F
  • 45F
  • 55F
  • 66F