Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: The density of a gas refers to

  • pounds per cubic foot
  • pounds per square foot
  • pounds per absolute pressure
  • cubic feet per pound

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

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

3: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.

  • 75
  • 100
  • 50
  • 24

4: What is the boiling point of refrigerant governed by?

  • Compressor RPM's
  • P&T relationship
  • Evaporator temperature
  • Condenser sub-cooling

5: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be

  • 66.1 psig
  • 43.3 psig
  • 50.2 psig
  • 70.8 psig

6: Where a refrigeration or air conditioning system is installed,

  • it shall not be operated below prescribed pressuers
  • A field inspection shall be made before it is put into service
  • The company who installed the system must notify the fire department in the jurisdiction where installed
  • the form or certificate shall be authorized by the Department of Public Safety

7: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

8: Heat that changes the physical state of a substance without effecting a change in its temperature is known as

  • specific heat
  • sensible heat
  • lost heat
  • latent heat

9: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?

  • 58
  • 96
  • 88
  • 38

10: What is used to check very low pressure?

  • Hydrometer
  • Velometer
  • Manometer
  • Hygrometer

11: 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

12: Which of the following is an inorganic refrigerant?

  • R-22
  • Ammonia
  • Chlorofluorocarbons
  • All of the above

13: 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

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

14: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.

  • 2.0
  • 2.5
  • 3.0
  • 5.5

15: When an inspection is needed, how often must it be done?

  • every 36 months
  • every 24 months
  • every 18 months
  • annually

16: The gauge thickness required on a CO2 tank construction is

  • 3/32"
  • 1/16"
  • 5/16"
  • 1/8"

17: What refrigerant were phased out in 2004?

  • R-11
  • R-22
  • R-134a
  • R-12

18: When should a relief valve start to function?

  • Two times it's working pressure
  • At it's set pressure
  • 10 psi before it's set pressure
  • Before the purge station discharges

19: Industrial occupancy is

  • a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
  • is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
  • a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
  • Both a and b are correct

20: A high side float is a

  • metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
  • float type valve that controls the crankcase oil level
  • float type switch that stops the compressor when the pressure on the high side becomes too high
  • float type valve that controls the amount of refrigerant stored in the receiver

21: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UL and UM
  • UV or UR
  • UM or UL
  • UL and UR

22: 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 of that portion of a premise where more than 100 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

23: The boiling point of a refrigerant is based on

  • Temperature
  • Heat content
  • a pressure-temperature relationship
  • None of the above.

24: An example of direct system is

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

25: What is the typical air conditioning operating pressures for R-22?

  • 60 psi suction 210 psi discharge
  • 25 psi suction 125 psi discharge
  • 105 psi suction 340 psi discharge
  • None of the above