Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: An air conditioning system rated for 36,000 BTU's is equivalent to

  • two tons of cooling
  • three tons of cooling
  • one ton of cooling
  • 12,000 tons of cooling

2: When must refrigeration system covered by the code be inspected?

  • Not required
  • Upon installation
  • Annually and when installed
  • Annually

3: What chemical in the refrigerant set off the leak detection alarm?

  • Fluorine
  • Chlorine
  • Both A and B
  • none of the above

4: Who authorizes changes to the safety codes?

  • Contractor who last serviced the system.
  • Person in charge of the facility
  • Person who pulled the permit
  • Board of Boilers

5: In an A/C unit, dirty filters will cause

  • high discharge pressure
  • high suction pressur
  • low oil pressure
  • low suction pressure

6: The start winding has _____ turns than the run winding.

  • more
  • less
  • the same
  • none of the above

7: All electrical work done on refrigeration systems must comply with

  • NEC and Massachusetts Modifications
  • OSHA
  • Department of Energy
  • ASHREA-15 Section 9.2.1

8: How many forces operate a thermostatic expansion valve?

  • 3
  • 2
  • 1
  • 4

9: Dew point is

  • the temperature above which water vapor in the air will start to condense
  • the temperature below which water vapor in the air will start to evaporate
  • the temperature below which water vapor in the air will start to condense
  • the temperature of air of 50% RH

10: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.

  • HCFC-123
  • ammonia
  • Lithium bromide
  • CFC-11

11: What is the minimum height refrigeration piping should be placed against walls?

  • 72"
  • 7.25'
  • 6'
  • Ceiling height

12: Which refrigerant(s) is an HFC?

  • R-22
  • R-410A
  • R-502
  • All of the above

13: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UL and UR
  • UV or UR
  • UM or UL
  • UL and UM

14: Pipe identification labels are required when the system contains more than

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

15: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

16: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

  • 2F difference
  • a ling psychrometer doesn't have two theremometers.
  • nearly the same
  • far apart or greater difference

17: The formula for Pure Power in a resistance circuit is

  • Watts = volts X amps
  • Kw = volts X amps
  • Watts X power factor
  • Watts X amps.

18: A cross charged power element on an expansion valve would normally be used in what temperature range?

  • -100F to -40F
  • -40F to 0F
  • 30F to 50F
  • 0F-38F

19: What must be done if refrigeration lines pass through a concrete floor?

  • installed through a pipe casing
  • leak checked
  • moisture barrier
  • insulated

20: A direct system

  • is a self-contained complete factory made and tested system
  • is where the refrigerant comes in contact with the space refrigerated
  • is on where brine is cooled & circulated to the space refrigerated
  • is one which encloses a separate body of evaporative refrigerant

21: What is used to check very low pressure?

  • Hygrometer
  • Manometer
  • Hydrometer
  • Velometer

22: On a TXV, the purpose of an external equalizer is to?

  • compensate for a pressure drop across the evaporator coil
  • allow a greater adjustment spam
  • Increase the pressure on the top of the power head diaphragm
  • balance the evaporator load

23: All low-pressure chillers use which type of compressor?

  • Rotary
  • Centrifugal
  • Scroll
  • Reciprocating

24: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.

  • 350 psig, 120 psig
  • 455 psig, 185 psig
  • 257 psig, 77 psig
  • 226 psig, 68 psig

25: How many gallons of water per pound of ammonia do you need?

  • 1
  • 5
  • 20
  • 15