Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Give an example of a secondary coolant?

  • R-717
  • R-12
  • R-718
  • R-410A

2: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.

  • True
  • False

3: Viscosity is

  • the ability of oil to flow
  • measure of weight
  • a measure of heat content
  • the coefficient of external friction

4: When should a relief valve start to function?

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

5: The 522 CMR 9.00 has adopted for reference ASHRAE ____

  • 10
  • 15
  • 25
  • III

6: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 50
  • 25
  • 66
  • 22

7: Color is important in oil because

  • can tell us something about the refining of oil
  • it makes sight glasses easy to read
  • allows you to see into crankcase
  • it indicates the viscoisty.

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

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

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

  • hydrometer
  • anemometer
  • Psychrometer
  • refractometer

10: Start to Run windings will have what resistance?

  • All will be at equal values
  • The least resistance value
  • The most resistance value
  • Somewhere between the actual start winding and run winding resistance value

11: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • does not require a pressure-limiting device
  • shall have a pressure limiting device installed on the high side of the system
  • shall be inspected by the Boiler of Inspectors bi-annually
  • shall have a pressure limiting device and a pressure relief valve installed

12: The equivalent length of pipe in a water piping system is

  • the total length of pipe plus equivalent-length of fittings
  • the total length of pipe plus equivalent of fittings multiplied by 2.31
  • the total length of pipe as you would measure it plus 25% for fittigns
  • the total length of pipe as you would measure it

13: What pipe can not be used for refrigeration?

  • L
  • M
  • K
  • N

14: B3 refrigerants are considered

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

15: A start capacitor in series with a start winding will

  • increase running efficiency
  • increase the amp draw of the motor
  • decrease the amp draw of the motor
  • increase starting torque

16: Where can 50/50 solder be used on?

  • suction line
  • liquid line
  • discharge line
  • none of the above

17: While the system is operating, the discharge line should be

  • 10-15F warmer than ambient
  • room temperature
  • too hot to hold by hand
  • at the same temperature as the crankcase

18: A moisture indicator must

  • be filled with liquid
  • be sight side up
  • be yellow
  • change color when exposed to moisture

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

  • Ohms
  • Herys
  • Volts
  • Amps

20: A normal operating evaporator temperature of R-22 for air conditioning is typically

  • 32F
  • 58F
  • 45F
  • 55F

21: A cross charged power element on an expansion valve would normally be used in what temperature range?

  • 30F to 50F
  • -40F to 0F
  • 0F-38F
  • -100F to -40F

22: The measurement of heat in a particular substance is

  • enthalpy
  • specific heat
  • sensible heat
  • latent heat

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

24: The heat picked up in the evaporator must equal to

  • the heat gained by the condenser
  • the heat of compression
  • the heat giving by the condenser
  • the heat lost by the medium being cooled

25: How many square inches per square foot?

  • 24
  • 144
  • 98
  • 64