Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Heat transferred by conduction from one body to another is done

  • via solids
  • via liquids
  • via heat rays
  • via radiation

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

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

3: Trichlorofluoromethane is the name of what refrigerant?

  • R-502
  • R-11
  • R-113
  • R-12

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

5: Ammonia (NH3) is a group III refrigerant

  • True
  • False

6: Name a reason that does not cause reduced condenser air quantity

  • Prevailing winds
  • Dirty Coil
  • High ambient temperature
  • Dirty fan blades

7: What is considered a cooling agent?

  • any liquid used for the transmission of heat when vaporization occurs
  • any liquid used for the transmission of heat without condensation
  • any liquid used for the transmission of heat without vaporization
  • any liquid used for the transmission of heat when condensation occur

8: On a pumpdown system, the liquid-line solenoid is controlled by the

  • low-ambient controller
  • thermostat
  • defrost timer
  • low pressure switch

9: Sensible heat is the heat added to a substance to

  • cause evaporation
  • change its state
  • raise its temperature
  • freeze it

10: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?

  • 208v
  • 277v
  • 240v
  • 120v

11: What is specific heat?

  • measured heat
  • heat required to raise the temperature of 1lb of a substance 1 degree
  • the specific heat required to change the state of one cubic foot of air to steam
  • none of the above

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

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

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

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

14: Which occupancy can ammonia be used in?

  • depends on the quantity of freon
  • redifential
  • industrial
  • commercial

15: When should a relief valve start to function?

  • Before the purge station discharges
  • Two times it's working pressure
  • At it's set pressure
  • 10 psi before it's set pressure

16: The density of a gas refers to

  • pounds per absolute pressure
  • cubic feet per pound
  • pounds per square foot
  • pounds per cubic foot

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

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

18: What is NOT a positive displacement compressor.

  • Scroll
  • Rotary
  • Reciprocating
  • Centrifugal

19: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with

  • methyl chloride
  • trichlorotrifluoromethane
  • ammonia
  • R-718

20: What is Absolute Zero?

  • -400F
  • -773F
  • -460F
  • -640F

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

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

22: 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
  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
  • is a reciprocating type compressor with 2 or more pistons

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

  • 20
  • 5
  • 1
  • 15

24: What type of oil is used in R-410A systems?

  • mineral oil
  • naphthene
  • polyalkylene glycol (PAG)
  • polyolester (POE)

25: A motor starter contains a thermal overload and a

  • transformer
  • 3-way relay
  • contactor
  • solenoid