Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

  • 2.2
  • 1.5
  • 1.2
  • 1

2: How are refrigerant blends classified?

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

3: How much clearance do you need around the perimeter of electrical panels?

  • 36"
  • 12"
  • 18"
  • 24"

4: 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

5: Which of the following controllers would you expect to be most sensitive to temperature changes?

  • low voltage t-stat
  • aquastat
  • immersion controller
  • line voltage t-stat

6: How many groups of refrigerants are there?

  • 3
  • 5
  • 7
  • 1

7: 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

8: What refrigerant has zero ozone depletion

  • HFC
  • CFC
  • HCFC
  • None of the above

9: What type of oil is used in R-410A systems?

  • mineral oil
  • naphthene
  • polyalkylene glycol (PAG)
  • polyolester (POE)

10: One watt of electrical energy in a resistive heater will provide _____ BTU/hr

  • 16.64
  • 34.15
  • 3.415
  • 6.830

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

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

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

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

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

  • capacitance
  • amperage
  • resistance
  • voltage.

14: "R" represents ___ in the Ohm's law formula

  • resistance
  • capacitance
  • amperage
  • voltage

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

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

16: Can ammonia be used on domestic system?

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

17: The leaving chilled water set point for comfort cooling is typically?

  • 60
  • 38
  • 45
  • 66

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

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

19: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

  • 5KW
  • 746 watts
  • 600 watts
  • 1000 watts

20: 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

21: Secondary refrigerants are usually

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

22: When using nitrogen for brazing, the pressure should be:

  • Very low
  • 50-100 psig
  • 125 psig
  • Slightly below atmospheric

23: A positive displacement compressor is

  • is a reciprocating type compressor with 2 or more pistons
  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber

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

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

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

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