Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Ohm's Law indicates Amps X Resistance = ___________.

  • Volts
  • Current
  • Ohms
  • Impedance

2: What is the refrigerant dichlorodifluoromethane?

  • R-134A
  • R-22
  • R-123
  • R-12

3: R-11 has the greatest corrosive effect on

  • Bronze
  • Aluminum
  • Copper
  • Magnesium

4: Laten heat is associated with a change in state of a refrigerant but not temperature

  • True
  • False

5: Indirect systems using Group II refrigerants

  • shall have all refrigerant containing parts except piping, installed in a Class T machine room
  • shall be used in refrigeration system in excess of 1,000 lbs
  • shall be used in refrigeration system less than 1,000 lbs
  • shall be used for mechanical equipment only

6: Clearance volume

  • affects compressor capacity
  • varies depending on compressor speed
  • has no effect on compressor capacity
  • is the same on all compressors

7: What type of fuses must be used on a HVAC system?

  • TR Type, Duel Element, Time Delay
  • Fast blow
  • 10% lower than RLA
  • none of the above

8: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 330 lbs
  • 660 lbs
  • 500 lbs
  • 55 lbs

9: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?

  • phosgene gas sening
  • refrigerant sensing
  • CO Sensing
  • A group sensing

10: The oil separator is always inserted in the system

  • in the discharge line
  • where it can be easily serviced
  • to prevent oil logging
  • in a cool spot

11: At higher altitudes, boiling temperatures

  • increase
  • are unaffected
  • depends on the refrigerant
  • decrease

12: Gauge pressure is

  • Barometric pressure
  • Atmospheric pressure
  • Force of pressure above that of atmosphere
  • Absolute pressrue

13: Usually dry bulb temperature is

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

14: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is

  • 11F
  • 9F
  • 21F
  • 29F

15: When can 50/50 solder be used?

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

16: While the system is operating, the discharge line should be

  • room temperature
  • too hot to hold by hand
  • 10-15F warmer than ambient
  • at the same temperature as the crankcase

17: Refrigerant restricted in 2004 but used for transition for decades:

  • R-134A
  • R-22
  • R-11
  • R-123

18: Fractionation occurs when

  • the pressures increase as the heat load increases
  • some of the blended refrigerant evaporates or condenses before the rest of the blend
  • the pressures decreases as the heat load decreases
  • when a fraction of refrigerant is added as the full charge

19: Whoever owns/uses a refrigeration or air conditioning system covered by this code

  • must notify the Department of Public Safety prior to starting the system
  • shall be licensed by the Commonwealth of Massachusetts according to CMR 522
  • shall make application for inspections to the Chief of Inspectors
  • None of the above

20: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

  • lower
  • there is no Group B1 refrigerants
  • higher
  • the same

21: Relief valves are rated in

  • pounds of air per hour
  • pounds of air per minute
  • gallons of water per minute
  • gallons of water per hour

22: Dual-pressure relief devices should be installed on

  • vessels of 10 cubic feet or less
  • vessels of 3 cubic feet or more
  • vessels of 3 cubic feet or less
  • vessels of 10 cubic feet or more

23: What is a megaohm meter?

  • An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
  • Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
  • An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
  • An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested

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

  • Insulated
  • Inspected
  • Leak tested
  • Pressurized

25: Where is an EPR valve located on a multi-evaporator system?

  • Suction line at the compressor
  • Suction line of the coolest evaporator
  • Suction line of the warmest evaporator
  • Suction line prior to the accumulator of the lowest temperature system