Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: What type of voltage cause a potential relay to open?

  • 24 volt supply from the thermostat
  • 120 volt line voltage
  • Pick-up voltage
  • none of the above

2: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

3: The solution that is pumped into the concentrator in an absorption chiller is referred to as the

  • strong solution
  • concentrated solution
  • absorbed solution
  • weak solution

4: Pressure vessels with an internal volume of 3 cubic feet or less

  • shall use pressure relief devices
  • do not need pressure relief protection
  • shall use fusible plugs
  • shall use pressure relief devices or fusible plugs

5: 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

6: What does an anemometer measure?

  • temperature
  • amperage
  • voltage
  • velocity

7: What would be the classification of a church?

  • Large mercantile
  • Place of assembly
  • Industrial
  • Institutional

8: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 6.6 lbs
  • 44 lbs
  • 13.9 lbs
  • 22 lbs

9: The location of the thermal bulb for the TXV on the evaporator effects

  • both the pressure and temperature in the feeler bulb
  • the amount of superheat required to operate the TXV
  • the amount of liquid in the evaporator
  • the amount of gas in the evaporator

10: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is

  • start the comrpessor
  • start the fan and circulating pump
  • reset the expansion valve
  • reset the safety valve

11: Gauge pressure is

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

12: NH3 is

  • lithium bromide
  • R-718
  • ammonia
  • R-508A

13: What is the temperature that a liquid and a vapor can exist in equilibrium called?

  • Wet bulb temperature
  • Saturated temperature
  • Critical temperature
  • Dry bulb temperature

14: Absolute pressure is

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

15: Where a refrigeration or air conditioning system is installed,

  • The company who installed the system must notify the fire department in the jurisdiction where installed
  • A field inspection shall be made before it is put into service
  • it shall not be operated below prescribed pressuers
  • the form or certificate shall be authorized by the Department of Public Safety

16: 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

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

  • 10%
  • 15%
  • 20%
  • 5%

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

  • resistance
  • amperage
  • capacitance
  • voltage.

19: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

20: Which of the following is a drop-in for R-22

  • R-410A
  • R-134A
  • R407C
  • None of the above

21: What is the typical air conditioning operating pressures for 410A?

  • 60 psi suction, 210 psi discharge
  • 25 psi suction, 125 psi discharge
  • 105 psi suction, 350 psi discharge
  • None of the above

22: What is the boiling point of refrigerant governed by?

  • P&T relationship
  • Condenser sub-cooling
  • Compressor RPM's
  • Evaporator temperature

23: A 3-cubic foot receiver must have what type of relief valve?

  • fusible plug
  • relief valve
  • rupture device
  • none of the above

24: When an A/C system is excessively low on refrigerant

  • it can become contaminated with water
  • there can be nuisance trip outs
  • the suction line may be too hot to touch
  • All of the above

25: What does safe access mean?

  • Locked doors
  • OSHA approved
  • Well-lit exit signs
  • A clear unobstructed path to the equipment and controls