Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above

2: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 75%
  • 100%
  • 90%
  • 80%

3: 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

4: Name three things that must be done when changing refrigeration lubricant?

  • You can't change lubricants.
  • Nothing must be done
  • Place sign, check for leaks, insulate
  • Make sure it's compatible, notify owner, notify AHJ

5: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit

  • 977.6 watts
  • 9.776 watts
  • 9,776 watts
  • .9776 watts

6: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a

  • purge
  • surge
  • splurge
  • merge

7: Capacitors are rated in

  • kelvins
  • micro-farads
  • megaohms
  • volt - amperes

8: Heat cannot of itself, pass from a

  • cold to a warmer body
  • warm to a colder body
  • state of hot energy to a state of cold energy
  • None of the above

9: Usually dry bulb temperature is

  • lower than dry bulb temperature
  • higher than wet bulb temperature
  • same as wet bulb temperature
  • not important and shall be ignored

10: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • rupture plug
  • fusion plug
  • fusible plug
  • relief plug

11: 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

12: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 1
  • 1.5
  • 1.2
  • 2.2

13: Suction valve unloaders afford an effective means of

  • evaporator control
  • superheat control
  • refrigerant control
  • capacity control

14: When a refrigeration or air conditioning system is installed

  • a field inspection shall be made before it is put into service
  • it shall be approved by the owner for proper operation.
  • the form of certificate shall be authorized by the Department of Pubic safety
  • it shall not be operated below prescribed pressures

15: Can ammonia be used on domestic system?

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

16: All serviceable components of a refrigeration system shall be provided with

  • service manuals
  • name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
  • safe access
  • manufactures instructions on start-up procedures

17: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are

  • companion or block valves
  • king valves
  • gate or globe valves
  • ball valves

18: What is specific heat?

  • measured heat
  • heat required to raise the temperature of 1lb of a substance 1 degree
  • the specific heat required to change the state of one cubic foot of air to steam
  • none of the above

19: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.

  • 10
  • 18
  • 15
  • 24

20: Large mercantile occupancy is

  • a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
  • a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
  • a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.

21: What refrigerant doesn't have to be classifted?

  • R-718
  • R-711
  • R-717
  • R-134a

22: There can be no airflow from an occupied space through a machine room unless what?

  • System is high velocity
  • System is ducted and sealed
  • Duct is not located in the ceiling
  • None of the above.

23: A High-Probability System

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

24: What type of material can't be used on the outlet of a relief valve?

  • Magnesium alloy
  • PVC
  • Copper
  • Stainless steel

25: What refrigerant were phased out in 2004?

  • R-12
  • R-134a
  • R-11
  • R-22