Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Which creates more of a heat load?

  • 70% RH
  • 50% RH
  • 90% RH
  • 30% RH

2: Pi equals approximately

  • 12,000
  • 746
  • 3.41
  • 3.14

3: Pressure vessels with an internal volume of 3 cubic feet or more

  • shall use fusible plugs
  • do not need pressure relief protection
  • shall use pressure relief devices
  • shall use pressure relief devices or fusible plugs

4: B3 refrigerants are considered

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

5: Machinery rooms must be vented to ______?

  • outdoors
  • neutralizing tank
  • unoccupied spaces
  • basement

6: What refrigerant were phased out in 2004?

  • R-22
  • R-11
  • R-134a
  • R-12

7: The purpose of an accumulator is to

  • reduce friction loss to the flow of refrigerant
  • store excess refrigerant from the reciver
  • assure no liquid returns to the compressor
  • filter out impurities from the system

8: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the

  • low side of the system
  • high side float assembly
  • cap tube
  • none of the above

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

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

10: Name an HCFC refrigerant(s):

  • R-22
  • R-123
  • R-11
  • both a & b

11: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?

  • Moisture indicator
  • Stop valve
  • Muffler
  • Foot valve

12: R-717 is

  • trichloromethane
  • water
  • ammonia
  • carbon dioxide

13: How many refrigerant classifications are there for flammability?

  • 2
  • 7
  • 3
  • 1

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

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

15: 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

16: Fusible plugs shall not be used with pressure vessels of

  • 3 cubic feet or more
  • 3 cubic feet or less
  • 15 cubic feet or more
  • 15 square feet or less

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: Low ambient controls are used when

  • always
  • economizers are used
  • on air conditioning systems only
  • when systems run all year round

19: The rupture disc on a low-pressure chiller typically releases pressure at

  • 15 psig
  • 5 psig
  • 0 psig
  • 10 psig

20: An azeotropic refrigerant is

  • a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
  • a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
  • a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
  • none of the above

21: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by

  • District Engineering Inspectors
  • Commissioned Inspectors
  • Master licensed Technician
  • both a or b

22: The critical temperature of a refrigerant gas occurs when

  • any increase in pressure will not liquefy the gas
  • the gas returns to a liquid
  • the gas is no longer saturated
  • any decrease in pressure will cause condensation

23: Where must a refrigeration contractor's license number be displayed?

  • Trucks, invoices, and advertising
  • Uniforms, checks, and invoices.
  • Trucks, license plates, and uniforms
  • Truck, office, every job, and on all equipment

24: If the spring is adjusted to increase the superheat, this new setting will

  • allow more liquid into the evaporator
  • shorten the frost line
  • lengthen the frost line
  • have no effect on the frost line

25: An accumulator can be located between the

  • evaporator and compressor
  • first stage and second stage compressors
  • condenser and evaporator
  • compressor and condenser