Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

  • red
  • blue
  • orange
  • green

2: "P" represents ______ in the Watt's law formula

  • voltage
  • reactance
  • amperage
  • watts

3: Class T machine room

  • shall have refrigerant leak detecting systems installed inside and outside the room
  • shall have remote controls to stop the action of the refrigerant compressor
  • shall include closets used for setting equipment
  • has no flame producing apparatus permanently installed

4: R-717 is

  • carbon dioxide
  • water
  • trichloromethane
  • ammonia

5: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called

  • non-positive displacement compressor
  • negative displacement compressor
  • non-volumetric displacement compressor
  • neutral chamber-type compressor

6: On a single phase motor, when does the start winding cut out?

  • Start windings do no cut-out of the run cycle
  • At 25% of its full rated speed
  • At 50% of its full rated speed
  • At 75% of its full rated speed

7: The first step in mechanical refrigeration is

  • condensation
  • expansion
  • compression
  • evaporation

8: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?

  • 277v
  • 120v
  • 208v
  • 240v

9: When a refrigerating machinery room is used, the emergency procedures shall be posted

  • inside the room, immediately adjacent to each door
  • outside the room, immediately adjacent to each door
  • on a conspicuous card located near the compressor
  • on a conspicuous card located near the evaporator

10: Gauge pressure is

  • what a gauge reads when checking pressures on a chilled water system.
  • absolute pressure
  • force of pressure above that of atmospheric
  • atmospheric pressure

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

  • gas
  • liquid
  • solid
  • All of the above

12: An example of an "Expendable Refrigerant" is

  • lithium bromide
  • liquid nitrogen
  • ammonia
  • liquid oxygen

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

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

14: What is Trichlorotrifluoromethane?

  • R-113
  • R-11
  • R-12
  • R-13

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

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

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

  • screw
  • scroll
  • centrifugal
  • reciprocating

17: Pressure is equivalent of

  • Area X Force
  • Force
  • Force / Area
  • Force X Area

18: 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
  • 746 watts
  • 1000 watts
  • 5KW

19: A High-Probablity system

  • is a system highly likely to leak from a failed connection or component of such system
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is such that a leak of refrigerant from failed connections will enter the unoccupied space
  • is such that a leak of refrigerant from failed connections will enter the occupied space

20: 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

21: 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.

22: What's the purpose of a megohmmeter?

  • To measure low to very low resistance values
  • To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
  • To measure very high resistances
  • None of the above

23: Control systems can be classified by

  • tonnage of system
  • safety
  • economy of operation
  • source of power

24: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

25: Methyl Chloride is a halogenated refrigerant and should not come in contact with

  • aluminum
  • zinc
  • magnesium
  • all of the above