Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Pressure vessels with an internal volume of 3 cubic feet or more

  • shall use pressure relief devices or fusible plugs
  • shall use fusible plugs
  • do not need pressure relief protection
  • shall use pressure relief devices

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

  • 277
  • 480
  • 1/3 the voltage

3: A secondary coolant is defined as

  • a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
  • a low temperature refrigerant used for cascading systems
  • any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
  • any refrigerant direcly in contact with the cooling space for process cooling

4: The External equalizer of a TXV compensates for

  • pressure within the system
  • pressure drop across the evaporator coil
  • pressure within the evaporator
  • pressure drop across the condenser coil

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

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

6: Relief valves are rated in

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

7: If two 500 ohm resistors are connected in series, the resistance will be

  • 20 ohms
  • 500 ohms
  • 1000 ohms
  • 200 ohms

8: Clearance volume

  • varies depending on compressor speed
  • is the same on all compressors
  • has no effect on compressor capacity
  • affects compressor capacity

9: What is NOT a positive displacement compressor.

  • Centrifugal
  • Scroll
  • Reciprocating
  • Rotary

10: While water is evaporated in an evaporative condenser the impurities which were in the water are

  • accumulate in the sump water
  • blown to the atmosphere by the fan
  • remain in the air
  • washed out of the air by the spray pump

11: Can ammonia be used on domestic system?

  • no, unless there is proper ventilation system installed
  • yes, for systems under 10 tons
  • no
  • yes

12: R-22 is classified as a ____ refrigerant on the safety matrix.

  • B-1
  • B-2
  • A-2
  • A-1

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

  • 50
  • 10
  • 1
  • 100

14: A split-phase motor has a ______ winding and a ____ winding

  • run, common
  • duel-run, duel-start
  • run, start
  • start, common

15: The leaving chilled water set point for comfort cooling is typically?

  • 66
  • 38
  • 60
  • 45

16: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.

  • True
  • False

17: Who is permitted to access a refrigeration machine room?

  • Any employee
  • Anyone, it's a completely safe area
  • Contractors only
  • Authorized persons only

18: Evaporators within 18" of a heating coil must be equipped with a

  • zone valve
  • pressure relief device
  • high limit control
  • low limit control

19: Electricity involves the movement of electrons in atoms

  • True
  • False

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

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

21: Which of the following is not an air velocity meter?

  • Velometer
  • Anemometer
  • Anemotherm
  • Hydrometer

22: one BTU equals

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

23: If the power element of an expansion valve should lose its charge the valve would

  • go open
  • go closed
  • overfeed the evaporator
  • underfeed the evaporator

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

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

25: B3 refrigerants are considered

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