Refrigeration RT/RC Prep Quiz

Topics: All categories in the pool

Quiz Result Settings

1: Give an example of a secondary coolant?

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

2: If two 500 ohm resistors are connected in series, the resistance will be

  • 1000 ohms
  • 200 ohms
  • 500 ohms
  • 20 ohms

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

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

4: A capacitor in series with the start windings will do what?

  • Decrease the RLA to within 10% of its rating
  • Increase starting torque
  • Nothing
  • Increase run efficiency by 10% of its rating

5: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

6: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • Nothing must be done
  • Make sure its compatible, notify owner, and notify AHJ.
  • you can never change refrigerants
  • Place sign, check for leaks, and insulate suction line

7: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and

  • explosion precautions must be taken
  • the owner shall be informed
  • gas masks must be worn
  • no flames shall be permitted

8: Which of the following is an example of an azeotropic refrigerant?

  • R-404A
  • R-134A
  • R-410A
  • R-500

9: Trichlorofluoromethane is the name of what refrigerant?

  • R-502
  • R-11
  • R-113
  • R-12

10: Increasing superheat will do what to your frost line?

  • Nothing
  • Could either increase or decrease depending on the load conditions
  • Increasae
  • Decrease

11: What happens after your initial inspection of a pressure vessel?

  • Notify the Fire Marshal that the system has been inspected and approved
  • Notify the AHJ to let them know that the system been inspected
  • Inspector leaves a metal tag with a certification listed on it
  • There is a temporary shut-down until a final inspection can be performed.

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

  • 80%
  • 75%
  • 90%
  • 100%

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

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

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

  • amperage
  • resistance
  • voltage.
  • capacitance

15: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • “UM” and “UV”
  • “UL”
  • “UV”
  • “U” or “UM”

16: On a single phase motor, when does the start winding cut out?

  • 50% of its RLA speed
  • 100% of its RLA speed
  • 25% of its RLA speed
  • 75% of its RLA speed

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

  • 2.5
  • 5.5
  • 2.0
  • 3.0

18: Booster compressors connect to the ____ side of the compressor

  • low side
  • oil side
  • vapor
  • liquid

19: Which of the following is not an air velocity meter?

  • Velometer
  • Hydrometer
  • Anemometer
  • Anemotherm

20: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 330 lbs
  • 55 lbs
  • 500 lbs
  • 660 lbs

21: Ammonia is under what safety classification?

  • B2
  • B3
  • B1
  • A3

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

  • voltage
  • resistance
  • amperage
  • capacitance

23: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?

  • 5KW
  • 600 watts
  • 746 watts
  • 1000 watts

24: High side floats are used on centrifugal chiller systems are are considered critically charged systems.

  • are obsolete.
  • depends on the type of refrigerant being used
  • False
  • True

25: Secondary refrigerants are usually

  • Prestone anti-freeze
  • alcohol
  • expensive
  • water or brine