Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: B3 refrigerants are considered

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

2: If a halide torch is used for leak detection, what color is the flame if it detects a leak?

  • red
  • orange
  • blue
  • green

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

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

4: Which of the following is NOT a positive displacement compressor?

  • centrifugal
  • scroll
  • reciprocating
  • screw

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

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

6: Fusible plugs must have what marked on them?

  • Melting temperature in F
  • Melting temperature in C
  • Opening pressure
  • All of the above

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

  • resistance
  • capacitance
  • amperage
  • voltage

8: When can 50/50 solder be used?

  • in the low side
  • in the high side
  • liquid and suction lines
  • none of the above.

9: Cooling tower lowers condenser water temp by

  • condensation
  • evaporative cooling
  • running water thru a secondary heat exchanger
  • running fans at 100%

10: The principle used in continuous type absorption systems is

  • Dalton's Law
  • Ohm's Law
  • Boyle's Law
  • Charles's Law

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

  • 1
  • 5
  • 15
  • 20

12: All electrical work done on refrigeration systems must comply with

  • ASHREA-15 Section 9.2.1
  • OSHA
  • NEC and Massachusetts Modifications
  • Department of Energy

13: The Department that certifies the transportation of refrigerant is the

  • EPA
  • EPO
  • RSES
  • DOT

14: Dew point is

  • the temperature below which water vapor in the air will start to evaporate
  • the temperature above which water vapor in the air will start to condense
  • the temperature of air of 50% RH
  • the temperature below which water vapor in the air will start to condense

15: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.

  • There isn't enough information to answer.
  • 2.5
  • 1250
  • 2

16: Sublimation occurs when

  • liquid is formed from a gas
  • ice melts and turns to water
  • gas is formed from a liquid
  • gas is formed directly from a solid

17: The best way to determine the voltage requirement for an electrical component is to

  • read the nameplate data
  • read the voltage with a mulitmeter
  • check with the utility company
  • determine the capacity of the service panel

18: Liquid level gauges must be provided with what?

  • A red line
  • A low level mark
  • Automatic shut-offs
  • A relief valve

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

  • Under feed
  • Stay open
  • Close
  • Over feed

20: An oil pressure safety switch should be set at

  • 5 to 10 psi above low side pressure
  • 10 to 15 psi below low side pressure
  • 5 to 10 psi below low side pressure
  • 10-15 psi above low side pressure

21: A solder joint melts at temperatures of

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

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

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

23: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested

  • regularly
  • annually
  • quarterly
  • bi-annually

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

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

25: Halo-carbon refrigerants cannot be used with what material?

  • Stainless Steel
  • Magnesium alloy
  • Aluminum
  • Copper