Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

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

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

2: What type of pressure relief device is used on a CO2 system?

  • Glove valve
  • Rupture disk
  • Fusible plug
  • Gate valve

3: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is

  • lift voltage
  • run voltage
  • pick up voltage
  • boost voltage

4: The color code of a tank of ammonia is

  • white
  • silver
  • light green
  • lavender

5: Low pressure chiller systems use what type of compressor?

  • Reciprocating
  • Screw
  • Scroll
  • Centrifugal

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

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

7: Atmospheric pressure is equal to

  • 29.92" Hg
  • 14.7 psia
  • 14.7 psig
  • both a & b

8: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against

  • 88
  • 116
  • 108
  • 38

9: What must be done to all doors and access points in duct work going through a mechanical room?

  • Must be hindged
  • Must be screwed shut
  • Must be sealed and gasketed
  • All of the above

10: A thermometer inside a duct measures ____ heat.

  • latent
  • hidden
  • sensible
  • specific

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

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

12: When air is ducted through a machine room that services occupied space, What must be done?

  • Flanged and gasketed
  • Insulated and cross broke
  • Welded and seamed.
  • Ducted and sealed

13: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?

  • fusible plug
  • relief valve
  • rupture disc
  • all of the above

14: A hotel is considered a _______ occupancy.

  • mercantile
  • residential
  • commercial
  • institutional

15: 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

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

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

17: A Category D fluid

  • is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
  • is when the design pressure does not exceed 150 psi
  • a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
  • Both a and b are correct

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

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

19: What is the minimum size wire you can use on a 30 amp circuit?

  • 10 AWG
  • 16 AWG
  • 12 AWG
  • 14 AWG

20: A single pole-double throw switch used how many wires excluding the ground wire?

  • five
  • two
  • four
  • three

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

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

22: While water is evaporated in an evaporative condenser the impurities which were in the water are

  • blown to the atmosphere by the fan
  • accumulate in the sump water
  • remain in the air
  • washed out of the air by the spray pump

23: R-410A is classified as a ____ refrigerant on the safety matrix.

  • A-2
  • B-1
  • B-2
  • A-1

24: Usually dry bulb temperature is

  • not important and shall be ignored
  • higher than wet bulb temperature
  • same as wet bulb temperature
  • lower than dry bulb temperature

25: When an electronic bridge is in balance the bridge output will be

  • 1 volt
  • 15 volts
  • 0 volts
  • .01 volts