Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Secondary refrigerants are usually

  • expensive
  • Prestone anti-freeze
  • water or brine
  • alcohol

2: What refrigerant were phased out in 2004?

  • R-11
  • R-22
  • R-12
  • R-134a

3: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?

  • When there are sprinklers above
  • When there is a space 6' or more above it
  • When it's used as part of a supply or return air system
  • When its white

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

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

5: A High-Probablity system

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

6: Total heat of a substance is considered

  • sensible heat
  • specific heat
  • empathetical
  • enthalpy

7: Capacitors are rated in

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

8: 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

9: A declaration test is needed when the system contains more than

  • 120 lbs
  • 55 lbs
  • 65 lbs
  • 110 lbs

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

  • 550 lbs
  • 330 lbs.
  • 660 lbs
  • 55 lbs

11: When the compressor is below the condensor

  • traps are not needed on this type of system
  • traps are needed on the suction line
  • traps are needed on the oil return line
  • traps are needed on the discharge line

12: Which refrigerant replaced R-12?

  • R-134A
  • R-407A
  • R-410A
  • R-22

13: 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.

14: What device should be used on low-temperature freezers?

  • high capacity TXV
  • oil separator
  • discharge muffler
  • hot-gas by-pass

15: What is the refrigerant chlorodifluoromethane?

  • R-123
  • R-134a
  • R-12
  • R-22

16: Which of the following most closely represents the concentration of Li-Br in a absorption system?

  • 50% Li-Br, 50% tap water
  • 40% Li-Br, 60% distilled water
  • 40% Li-Br, 60% tap water
  • 60% Li-Br, 40% distilled water

17: What type of pressure relief device is used on a CO2 system?

  • Glove valve
  • Fusible plug
  • Gate valve
  • Rupture disk

18: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Adiabatic
  • Pressure Temperature
  • Volume Temperature
  • Isothermal

19: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.

  • True
  • False

20: One ton of refrigeration is defined as ______ btu/minute.

  • 200
  • 60
  • 720,000
  • 12,000

21: How many flammability classifications are refrigerants in?

  • 3
  • 5
  • 7
  • 2

22: Who is permitted to access a refrigeration machine room?

  • Anyone, it's a completely safe area
  • Contractors only
  • Any employee
  • Authorized persons only

23: On cooling towers, what causes the condenser water to drop

  • tower fans
  • ambient temperatures
  • evaporation of the water droplets
  • sensible heat

24: How are refrigerant blends classified?

  • Based on worst case fractionation
  • Based on best case Fractionation
  • Blends don't have to be classified
  • Based on the oil used

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

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