Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.

  • 350
  • 100
  • 250
  • 400

3: When is the only time you can leave a service container attached to a system?

  • Leaking system
  • Recovery
  • Charging
  • Both b and c

4: Ammonia (NH3) is a group III refrigerant

  • True
  • False

5: A VRF system is a direct system

  • true
  • false

6: 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

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

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

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

9: R-11 belongs to Group

  • B-1
  • A-1
  • B-3
  • A-2

10: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.

  • 24
  • 36
  • 48
  • 18

11: Relief valves are rated in

  • gallons of water per hour
  • gallons of water per minute
  • pounds of air per hour
  • pounds of air per minute

12: The main cause of enacting the "no vending rule" of July 1st 1992 was

  • global warming potential
  • ozone depletion
  • both a & b
  • None of the above

13: If the power element on an expansion valve should lose its charge, the valve would

  • Stay open
  • Close
  • Over feed
  • Under feed

14: To determine the pump size needed for an open cooling tower system, the following must be known,

  • GPM and balanced head and friction head
  • GPM and friction head
  • GPM and unbalanced head and friction head
  • GPM, pipe size, and equivalent head.

15: A rule of thumb in air conditioning is ____ CFM per ton?

  • 100
  • 600
  • 500
  • 400

16: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

  • 116
  • 108
  • 88
  • 38

17: Ammonia belongs to Group

  • A-2
  • B-2
  • B-1
  • A-1

18: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side

  • 365 psig, 120 psig
  • 257 psig, 77 psig
  • 455 psig, 185 psig.
  • 226 psig, 68 psig

19: If your suction line is warmer than the room temperature, this may indicate

  • below normal superheat
  • an over charge
  • a low charge
  • plugged air filter

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

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

21: When air is ducted through a machine room that services occupied space, What must be done?

  • Ducted and sealed
  • Flanged and gasketed
  • Welded and seamed.
  • Insulated and cross broke

22: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 660 lbs
  • 55 lbs
  • 550 lbs
  • 330 lbs.

23: How much clearance do you need around the perimeter of electrical panels?

  • 24"
  • 36"
  • 18"
  • 12"

24: Three-phase motors have what type of windings?

  • three run windings and 3 start windings
  • three run windings
  • one start winding and one run winding.
  • three start windings

25: High pressure controls should be set no higher than

  • 25% of set point
  • 90% of set point
  • 80% of set point
  • 10% of set point