Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Ammonia vaporization takes place at what temperature?

  • -110F
  • -28F
  • -32F
  • -460F

2: In a horizontal shell & tube condenser, the ammonia is liquefied by

  • removing the latent heat of vaporization
  • removing the latent heat of fusion
  • passing thru the tubes from top to bottom
  • water sprayed over condenser

3: A check valve is a device

  • designed to allow the flow of refrigerant gas in both directions
  • that is always spring loaded
  • with a pressure drop
  • found on high pressure steam systems

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

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

5: R-12. R-22, and R-40 are considered Group I refrigerants.

  • True
  • False

6: What refrigerant doesn't have to be classifted?

  • R-711
  • R-134a
  • R-717
  • R-718

7: High pressure controls should be set no higher than

  • 25% of set point
  • 10% of set point
  • 90% of set point
  • 80% of set point

8: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of

  • the high side
  • 2.5 times the design pressure
  • the aggregate of the high side and low side
  • the low side

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

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

10: To determine the pump size needed for an open cooling tower system, the following must be known,

  • GPM and unbalanced head and friction head
  • GPM and balanced head and friction head
  • GPM, pipe size, and equivalent head.
  • GPM and friction head

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

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

12: Each machinery room shall contain

  • high and low pressure controls
  • a refrigerant detector located in an area where the refrigerant from a leak will concentrate
  • smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
  • a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate

13: Ammonia is under what safety classification?

  • A3
  • B2
  • B3
  • B1

14: Name a reason that does not cause reduced condenser air quantity

  • High ambient temperature
  • Dirty fan blades
  • Dirty Coil
  • Prevailing winds

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

  • amperage
  • voltage
  • capacitance
  • resistance

16: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to

  • hold up to 110% of the pumpdown charge
  • receive the pumpdown charge
  • Pumpdown procedures are not allowed with systems containing liquid recievers
  • release the charge when the pressure exceeds 310 psig or higher

17: What do you need to do when you install a new system?

  • Document the superheat and subcooling reading
  • Add refrigerant
  • Insulate the suction line before you take a superheat reading
  • Have it inspected

18: Sensible heat is the heat added to a substance to

  • freeze it
  • change its state
  • raise its temperature
  • cause evaporation

19: What type of fuses must be used on a HVAC system?

  • TR Type, Duel Element, Time Delay
  • Fast blow
  • 10% lower than RLA
  • none of the above

20: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within

  • 2 months
  • 14 days
  • 1 week
  • 30 days

21: What is Absolute Zero?

  • -640F
  • -773F
  • -400F
  • -460F

22: Where is the high-side float located on a chiller system?

  • liquid line
  • flash line
  • discharge line
  • inside the chiller barrel

23: How many flammability classifications are refrigerants in?

  • 3
  • 7
  • 2
  • 5

24: Which is the lowest vacuum?

  • 5" hg
  • 10 psia
  • 1,000 Microns
  • 5 psig

25: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • fusible plug
  • relief plug
  • fusion plug
  • rupture plug