Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: 1 HP = ____ Watts?

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

2: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 80%
  • 90%
  • 75%
  • 100%

3: What type refrigerant is NOT ozone depleting?

  • HCFC
  • Halon
  • CFC
  • HFC

4: Which of the following is an example of an azeotropic refrigerant?

  • R-500
  • R-410A
  • R-134A
  • R-404A

5: What is Absolute Zero?

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

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

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

7: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are

  • sight glass, weight, pressure, and frost line
  • sight glass, weight, pressure, and dipstick
  • Buss-eye, weight, pressure, and frost line
  • sight glass, weight, paper method, and frost line.

8: How would you know if there was a loss of crankcase pressure?

  • oil will thin out
  • oil will foam
  • oil level will rise
  • oil will thicken

9: A check valve is a device

  • designed to allow the flow of refrigerant gas in both directions
  • that is always spring loaded
  • with a pressure drop
  • found on high pressure steam systems

10: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

11: 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

12: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

  • 746 watts
  • 1000 watts
  • 5KW
  • 600 watts

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

  • anemometer
  • hydrometer
  • refractometer
  • Psychrometer

14: 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
  • 2.5 times the design pressure
  • the high side

15: A room having machinery but no flame producing apparatus permanently installed and operated is considered a

  • Class T machinery room
  • Class B machinery room
  • Class A machinery room
  • Class M machinery room

16: The proper location for an oil separator is between the

  • receiver and metering device
  • condenser and receiver
  • compressor and condenser
  • evaporator and compressor

17: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered

  • commercial occupancy
  • mixed occupancy
  • public assembly occupancy
  • institutional occupancy

18: How many volts would you read on a 480V system phase to phase?

  • 277
  • 480
  • 1/3 the voltage

19: Ammonia systems use ____ pressure to adjust oil pressure

  • air
  • liquid
  • spring
  • stream

20: What happens to copper joints when overheated?

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

21: "R" represents ___ in the Ohm's law formula

  • capacitance
  • voltage
  • resistance
  • amperage

22: R-11 has the greatest corrosive effect on

  • Aluminum
  • Bronze
  • Copper
  • Magnesium

23: 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?

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

24: A solder joint melts at temperatures of

  • 1,200F to 1,500F
  • 400F to 800F
  • less than 400F
  • 600F to 900F

25: Refrigerant restricted in 2004 but used for transition for decades:

  • R-123
  • R-11
  • R-22
  • R-134A