Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: R-22 is classified as a ____ refrigerant on the safety matrix.

  • A-1
  • A-2
  • B-2
  • B-1

2: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • Place sign, check for leaks, and insulate suction line
  • you can never change refrigerants
  • Make sure its compatible, notify owner, and notify AHJ.
  • Nothing must be done

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

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

4: R-22 is considered a(n)

  • HCFCH
  • CFC
  • HCFC
  • HFC

5: What is the refrigerant chlorodifluoromethane?

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

6: Transformers are rated in

  • volts-ohms
  • amps
  • volts
  • volt-amps

7: Class A refrigerants are considered

  • flammable
  • non-flammable
  • non-toxic
  • toxic

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

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

9: An example of direct system is

  • rooftop unit
  • chiller
  • absorber
  • none of the above

10: What refrigerant is an inorganic compound?

  • Ammonia
  • R-132A
  • R-410A
  • R-22

11: At higher altitudes, boiling temperatures

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

12: If a low-pressure chiller has a low-side leak, which of the following will most likely result?

  • Low head pressure and high suction pressure
  • Low suction pressure and low discharge pressure
  • High suction pressure and high discharge pressure.
  • High head pressure and low suction pressure

13: When the compressor is below the condensor

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

14: A pressure relief should be located at least _______ from windows and doors.

  • 20'
  • 15'
  • 25'
  • 30'

15: 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.

16: A mercury bulb controller is not recommended for

  • line voltage use
  • low voltage use
  • use where vibration is severe
  • line or low voltage use

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

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

18: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called

  • non-positive displacement compressor
  • negative displacement compressor
  • neutral chamber-type compressor
  • non-volumetric displacement compressor

19: The principle used in continuous type absorption systems is

  • Charles's Law
  • Dalton's Law
  • Ohm's Law
  • Boyle's Law

20: All machine rooms must be outfitted with a detector that _______?

  • activates an audible alarm
  • activates a visual alarm
  • starts the ventilation system
  • All of the above

21: Fusible plugs must have what marked on them?

  • Melting temperature in F
  • Melting temperature in C
  • Opening pressure
  • All of the above

22: 14.7 psia is equivalent to

  • atmospheric pressure at seal level
  • 29.92" Hg
  • 0 psig
  • All of the above.

23: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of

  • not enough oil in the system
  • oil in evaporator
  • low head pressure
  • moisture in the system

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

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

25: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?

  • motor starter
  • duel-voltage switch
  • printed circuit board (PCB)
  • centrifugal switch