Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Give an example of a secondary coolant?

  • R-12
  • R-718
  • R-410A
  • R-717

2: On a day with low relative humidity, the two thermometers on a sling psychrometer will read

  • 2F difference
  • a ling psychrometer doesn't have two theremometers.
  • far apart or greater difference
  • nearly the same

3: Which refrigerant class listed below is the most flammable?

  • B2
  • A3
  • A2
  • C3

4: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?

  • 20 amps
  • 15 amps
  • 10 amps
  • 5 amps

5: Where would the EPR valve be located on a multiple evaporator system?

  • outlet of the liquid line
  • outlet of low temperature evaporator
  • outlet of high temperature evaporator
  • inlet of the low temperature evaporator.

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

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

7: When using nitrogen for brazing, the pressure should be:

  • 50-100 psig
  • Slightly below atmospheric
  • 125 psig
  • Very low

8: Dual-pressure relief devices should be installed on

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

9: The freezing point of water at sea level is?

  • -10C
  • 32F
  • 32C
  • 0F

10: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8

  • low side of the system
  • the liquid side of the system
  • the vapor side of the system
  • high side of the system

11: The amount of heat required to raise the temperature of 1 lb of water 1F is?

  • 1 BTU
  • 1 Kelvin
  • 1 Therm
  • The rate of conduction

12: Large mercantile occupancy is

  • a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
  • a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
  • a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
  • a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.

13: What is considered a cooling agent?

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

14: What is specific heat?

  • measured heat
  • heat required to raise the temperature of 1lb of a substance 1 degree
  • the specific heat required to change the state of one cubic foot of air to steam
  • none of the above

15: A hissing noise at the expansion valve is a good indication that

  • expansion valve is oversized
  • nothing is passing thru
  • gas is passing thru it
  • liquid is passing thru it

16: The difference between saturated liquid and saturated vapor is

  • volume
  • temperature
  • heat
  • pressure

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

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

18: The actual expansion curve of compression follows most nearly which one of the following curves?

  • Volume Temperature
  • Isothermal
  • Adiabatic
  • Pressure Temperature

19: A High-Probablity system

  • is such that a leak of refrigerant from failed connections will enter the unoccupied space
  • is such that a leak of refrigerant from failed connections will enter the occupied space
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is a system highly likely to leak from a failed connection or component of such system

20: Single compound Refrigerants are classified by what two criteria?

  • Flammability and temperature range
  • Weight and color
  • Temperature range and hazardousness
  • Flammability and toxicity

21: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)

  • institutional occupancy
  • illegal occupancy
  • public assembly occupancy
  • commercial occupancy

22: Which of the following controllers would you expect to be most sensitive to temperature changes?

  • immersion controller
  • aquastat
  • low voltage t-stat
  • line voltage t-stat

23: A start capacitor is wired in _____ with the start windings.

  • series
  • parallel
  • series-parallel
  • junction

24: An example of an "Expendable Refrigerant" is

  • liquid oxygen
  • lithium bromide
  • ammonia
  • liquid nitrogen

25: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.

  • 100%
  • 75%
  • 90%
  • 80%