Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

2: What is the maximum voltage range allowed on an electrical circuit?

  • 5%
  • 10%
  • 20%
  • 15%

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

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

4: 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

5: Excessive head pressure is often caused by

  • air cooled condenser is plugged
  • thermostat set too high
  • insufficient refrigerant
  • leaking reed valve on the discharge side

6: How do you find net oil pressure on a compressor?

  • discharge pressure - suction pressure
  • gross oil pressure - suction pressure
  • gross oil pressure - discharge pressure
  • all of the above

7: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • Place sign, check for leaks, and insulate suction line
  • Make sure its compatible, notify owner, and notify AHJ.
  • you can never change refrigerants
  • Nothing must be done

8: Transformers are rated in

  • volt-amps
  • volts-ohms
  • volts
  • amps

9: "E" references ____ in the Ohm's law formula

  • amperage
  • resistance
  • capacitance
  • voltage

10: A relief valve shall be located at least ___ above grade.

  • 36'
  • 10'
  • 25'
  • 15'

11: A professional or office building would be considered what type of occupancy?

  • public assembly
  • commercial
  • business
  • mercantile

12: What refrigerant doesn't have to be classified?

  • R-422A
  • R-718
  • R-134A
  • R-717

13: A moisture indicator must

  • be yellow
  • be sight side up
  • be filled with liquid
  • change color when exposed to moisture

14: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is

  • drawing RLA and is running as it should
  • drawing LRA and is seized and should be replaced.
  • running hot
  • none of the above

15: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • run voltage
  • lift voltage
  • boost voltage
  • pick up voltage

16: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

17: Copper and its alloys shall not be used with ammonia

  • True
  • False

18: 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 M machinery room
  • Class A machinery room

19: What is used to check very low air pressures in air conditioning duct?

  • Vacuum gauge
  • Manometer
  • Barometer
  • Anemomter

20: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code

  • Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
  • over pressure protection
  • over pressure protection as well as a temperature protection device
  • over pressure protection and a rupture disc

21: The critical temperature of a refrigerant gas occurs when

  • the gas returns to a liquid
  • the gas is no longer saturated
  • any increase in pressure will not liquefy the gas
  • any decrease in pressure will cause condensation

22: A halide torch is most useful with a freon compression system

  • to detect refrigeration leaks in piping joints
  • to sweat flanges on the refrigeration piping
  • to release a sticking valve
  • to remove from from TXV's and evaporator coils

23: Which winding have the most turns?

  • depends on the motor phase
  • run
  • they have equal amount of turns
  • Start

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?

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

25: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.

  • 100
  • 80
  • 90
  • 110