Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

2: If your suction line is warmer than the room temperature, this may indicate

  • a low charge
  • plugged air filter
  • an over charge
  • below normal superheat

3: How much clearance do you need around the perimeter of electrical panels?

  • 24"
  • 18"
  • 12"
  • 36"

4: Ammonia belongs to Group

  • B-1
  • A-2
  • A-1
  • B-2

5: A Lithium-bromide system is an absorption system that

  • uses salts as an absorbent and lithium bromide as a refrigerant
  • uses ammonia as a refrigerant and lithium bromide as an absorbent
  • uses water as a absorbent and lithium bromide as a refrigerant
  • uses water as a refrigerant and lithium bromide as an absorbent

6: How many volts would you read on a 480V system phase to phase?

  • 0
  • 277
  • 480
  • 1/3 the voltage

7: "I" represents ____ in the Ohm's law formula.

  • resistance
  • amperage
  • capacitance
  • voltage.

8: What device should be used on low-temperature freezers?

  • discharge muffler
  • high capacity TXV
  • oil separator
  • hot-gas by-pass

9: A run capacitor is wired in series with the _____ windings.

  • start
  • start capacitor
  • run
  • common

10: How many flammability classifications are refrigerants in?

  • 5
  • 7
  • 3
  • 2

11: What should never be used in pressure testing refrigeration systems?

  • Oxygen
  • Compressed air
  • Nitrogen
  • Both a and b

12: Two systems using separate refrigerants that are superimposed upon one another is called

  • indirect
  • cascade
  • single stage
  • booster

13: Heat cannot of itself, pass from a

  • cold to a warmer body
  • warm to a colder body
  • state of hot energy to a state of cold energy
  • None of the above

14: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

15: Which refrigerant is lighter than air?

  • R-717
  • R-134a
  • R-11
  • R-123

16: What is considered a cooling agent?

  • any liquid used for the transmission of heat when condensation occur
  • any liquid used for the transmission of heat when vaporization occurs
  • any liquid used for the transmission of heat without condensation
  • any liquid used for the transmission of heat without vaporization

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

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

18: The heat picked up in the evaporator must equal to

  • the heat gained by the condenser
  • the heat giving by the condenser
  • the heat of compression
  • the heat lost by the medium being cooled

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

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

20: Class 3 refrigerants are

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

21: An example of direct system is

  • rooftop unit
  • chiller
  • absorber
  • none of the above

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

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

23: A pressure relief should be located at least _______ from windows and doors.

  • 15'
  • 25'
  • 20'
  • 30'

24: If a condenser is on a roof and the temperature is 35F and dropping the capacity

  • increases
  • run as designed with low ambient controls
  • decreases
  • doesn't change

25: How much refrigerant can be stored in a mechanical room outside of the system?

  • 150
  • 200
  • 330
  • 100