Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What is potential measured in?

  • Volts
  • Amps
  • Ohms
  • Henrys

2: A class A3 refrigerant is considered

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

3: 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.

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

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

5: "I" represents ____ in the Ohm's law formula.

  • resistance
  • amperage
  • capacitance
  • voltage.

6: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?

  • 506v
  • 550v
  • 660v
  • None of the above

7: Booster compressors connect to the ____ side of the compressor

  • vapor
  • low side
  • liquid
  • oil side

8: Joints in refrigeration piping must be _____ before being covered?

  • Pressurized
  • Inspected
  • Leak tested
  • Insulated

9: Usually dry bulb temperature is

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

10: When a refrigeration or air conditioning system is installed

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

11: Systems containing more than 110 pounds must have stop valves located at the

  • compressor suction inlet
  • compressor discharge outlet
  • receiver inlet and outlet
  • All of the above

12: Liquid line filter-driers on a 410A system must be rated for no less than

  • 400 psig
  • 1000 psig
  • 200 psig
  • 600 psig

13: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by

  • District Engineering Inspectors
  • Commissioned Inspectors
  • Master licensed Technician
  • both a or b

14: A motor starter is a device that includes an overload and a _______?

  • contactor
  • 2-pole contacts
  • duel-coil
  • all of the above

15: Absolute pressure is

  • Gauge Pressure
  • Atmospheric Pressure
  • Gauge + Atmospheric Pressure + Pi
  • none of the above

16: A chiller entering and leaving temperature difference is?

  • 50 degrees F
  • 10 degrees F
  • 5 degrees F
  • 20 degrees F

17: In a motor, an internal overload might open if

  • there's an open start winding
  • there's an excess current draw through the motor
  • there was a high pressure refrigerant was used for a low pressure system.
  • there's a direct short

18: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?

  • Solenoid valve
  • EPR valve
  • CPR valve
  • EEV

19: The Board of Boilers adopts by reference

  • the MACS Pressure Vessel Code of Massachusetts
  • the 1997 ANSI/ASHRAE Safety Code
  • Montreal Protocol Safety Code
  • MSCA Code

20: What is NOT a positive displacement compressor.

  • Centrifugal
  • Scroll
  • Reciprocating
  • Rotary

21: High pressure controls should be set no higher than

  • 80% of set point
  • 10% of set point
  • 25% of set point
  • 90% of set point

22: RPM's of a centrifugal compressor are at approximately?

  • 500
  • 10,000
  • 15,000
  • 30,000

23: Give an example of a secondary coolant?

  • R-717
  • R-718
  • R-12
  • R-410A

24: What is the amp draw of a 40 VA transformer at 24 volts

  • 106 amps
  • 1K amps
  • 1,000 amps
  • 1.6 amps

25: R-12 is

  • dichlorodifluoromethane
  • dichlorofluoromethane
  • dichloromethane
  • trichlorofluoromethane