Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Bubbles in the liquid line sight glass could be caused by

  • bad low pressure switch
  • leaking discharge valves in the compressor
  • plugged drier
  • overcharge of oil

2: By using nitrogen within a pipe during brazing operation,

  • Copper oxide formation is prevented
  • Discoloration is prevented
  • The explosion hazard is confined
  • Exterior scale formation is minimized

3: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • sensible heat
  • specific heat
  • latent heat
  • lost heat

4: How would you know if there was a loss of crankcase pressure?

  • oil will thin out
  • oil will foam
  • oil will thicken
  • oil level will rise

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

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

6: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • does not require a pressure-limiting device
  • shall have a pressure limiting device installed on the high side of the system
  • shall be inspected by the Boiler of Inspectors bi-annually
  • shall have a pressure limiting device and a pressure relief valve installed

7: A positive displacement compressor is

  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
  • 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
  • is a reciprocating type compressor with 2 or more pistons

8: When the compressor is below the condensor

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

9: Halogenated refrigerants cannot be used with what material?

  • Stainless steel
  • Magnesium alloy
  • Aluminum
  • Copper

10: Class 3 refrigerants are

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

11: How far from the window does a relief valve need to be according to ASHRAE-15?

  • At least 20'
  • At least 40'
  • There is no minimum for relief valve and windows.
  • At least 30'

12: A mercury bulb controller is not recommended for

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

13: What type of relief valve is used on a CO2 system?

  • rupture disc
  • fusible plug
  • gate valve
  • glove disc

14: The proper location for an oil separator is between the

  • compressor and condenser
  • condenser and receiver
  • evaporator and compressor
  • receiver and metering device

15: Dual-pressure relief devices should be installed on

  • vessels of 10 cubic feet or more
  • vessels of 3 cubic feet or less
  • vessels of 3 cubic feet or more
  • vessels of 10 cubic feet or less

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

  • Scroll
  • Reciprocating
  • Rotary
  • Centrifugal

17: Relief valves are rated in

  • pounds of air per hour
  • gallons of water per minute
  • gallons of water per hour
  • pounds of air per minute

18: Setting a pressure relief device shall not exceed ___ of the design pressure

  • 90%
  • 100%
  • 75%
  • 80%

19: 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

20: The best way to detect ammonia in brine is

  • potassium of line
  • carbonation of soda
  • nessler regaent
  • CO2 gas

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

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

22: What refrigerant has zero ozone depletion

  • HFC
  • CFC
  • HCFC
  • None of the above

23: What section governs pressure vessels?

  • Section 1 ASHREA 15 ASME fired
  • OSHA
  • Section ASHREA 34
  • Section 8 ASHREA 15 ASME unfired

24: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit

  • 977.6 watts
  • 9.776 watts
  • 9,776 watts
  • .9776 watts

25: B3 refrigerants are considered

  • toxic but non-flammable
  • non-toxic but flammable
  • non-toxic but non-flammable
  • toxic and highly flammable