How Well Do You Know About Refrigeration System? Trivia Quiz

100 Questions | Total Attempts: 308

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How Well Do You Know About Refrigeration System? Trivia Quiz

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Questions and Answers
  • 1. 
    Normal mid-temp refrigeration temperature is approximately __ degrees.
    • A. 

      32

    • B. 

      34

    • C. 

      40

    • D. 

      46

  • 2. 
    Heat is absorbed by evaporating a liquid refrigerant in the ___.
    • A. 

      Compressor

    • B. 

      Condenser

    • C. 

      Evaporator

    • D. 

      Receiver

  • 3. 
    Heat flows in what direction?
    • A. 

      Cold to warm

    • B. 

      Warm to cold

    • C. 

      Liquid to gas

    • D. 

      All of the above

  • 4. 
    Heat may be transferred from one body to another by ___.
    • A. 

      Radiation

    • B. 

      Conduction

    • C. 

      Convection

    • D. 

      All of the above

  • 5. 
    Refrigerant fluids are ___.
    • A. 

      Fluids that absorb heat inside a cabinet

    • B. 

      Fluids that release heat outside of a cabinet

    • C. 

      Fluids that absorb heat outside of a cabinet

    • D. 

      Both A and B

  • 6. 
    Which of the following illustrates the principle of convection?
    • A. 

      Movement of heat by fluid or air

    • B. 

      Heat waves from the sun

    • C. 

      Heat traveling through a solid object from end to end

    • D. 

      Radiation from the sun

  • 7. 
    Why do some technicians use the reamer to clean the end of the copper tubing?
    • A. 

      To restore full wall thickness

    • B. 

      To remove the burrs

    • C. 

      Only aluminum tubing should be burred

    • D. 

      All of the above

  • 8. 
    What indicates that correct brazing temperature has been reached?
    • A. 

      The metal surface turns blue

    • B. 

      A green color appears in the flame

    • C. 

      The brazing alloy melts when held in the flame

    • D. 

      The flux bubbles

  • 9. 
    When should you push and pull on a wrench?
    • A. 

      Push to loosen, pull to tighten

    • B. 

      Pull to loosen, push to tighten

    • C. 

      Always push

    • D. 

      Always pull

  • 10. 
    Refrigeration service valve wrench is used to __.
    • A. 

      Front sit the valve

    • B. 

      Back sit the valve

    • C. 

      Mid position the valve

    • D. 

      All of the above

  • 11. 
    In an AEV or AXV system, when does the needle valve open?
    • A. 

      This system has no needle valve

    • B. 

      When the liquid level in the evaporator fails

    • C. 

      When the compressor reduces the pressure in the evaporator

    • D. 

      When the evaporator pressure is low and the temp is above normal

  • 12. 
    In the TEV or TXV system, when does the needle valve open?
    • A. 

      This system has no needle valve

    • B. 

      When the liquid level in the evaporator fails

    • C. 

      When the compressor reduces pressure in the evaporator

    • D. 

      When the evaporator pressure is low and the temp is above normal

  • 13. 
    Why do most domestic refrigerators have a defrost system?
    • A. 

      Frost buildup corrodes the evaporator tubing

    • B. 

      Frost buildup can squeeze the tubing closed

    • C. 

      Frost buildup on evaporator reduces efficiency

    • D. 

      All of the above

  • 14. 
    In a compression refrigerator, oil buildup can cause a problem in the ___
    • A. 

      Crankcase

    • B. 

      Evaporator

    • C. 

      Motor

    • D. 

      Oil separator

  • 15. 
    What control determines the refrigerator cabinet temperature?
    • A. 

      Motor control

    • B. 

      Temperature control

    • C. 

      Shutoff valve

    • D. 

      High pressure switch

  • 16. 
    Automatic expansion valve usually adjusts the ___.
    • A. 

      Temperature in the cabinet

    • B. 

      Temperature in the evaporator

    • C. 

      Pressure in the evaporator

    • D. 

      Both B and C

  • 17. 
    Which type of compressors use crankshaft seal?
    • A. 

      Semi-hermetic

    • B. 

      Open-type

    • C. 

      Scroll

    • D. 

      Rotary

  • 18. 
    The device that changes low pressure vapor to high pressure is called?
    • A. 

      Metering device

    • B. 

      Open-type

    • C. 

      Condenser

    • D. 

      Compressor

  • 19. 
    The device that changes liquid to vapor is called?
    • A. 

      Compressor

    • B. 

      Condenser

    • C. 

      Evaporator

    • D. 

      Metering device

  • 20. 
    Why are expansion valves adjustable?
    • A. 

      To adjust fro different altitudes

    • B. 

      To adjust for different types of refrigerants

    • C. 

      To adjust for different sizes of liquid receivers

    • D. 

      Both A and B

  • 21. 
    What force causes a thermal-electric expansion valve to open?
    • A. 

      Vapor pressure

    • B. 

      Gravity

    • C. 

      An electromagnet

    • D. 

      A bimetal strip when heated

  • 22. 
    What force causes the solenoid valve to open?
    • A. 

      Vapor pressure

    • B. 

      Gravity

    • C. 

      An electromagnet

    • D. 

      A bimetal strip when heated

  • 23. 
    In a refrigerator that has capillary tube, what controls the box temperature?
    • A. 

      Sensing bulb

    • B. 

      Low pressure control

    • C. 

      High pressure control

    • D. 

      Temperature control

  • 24. 
    What type of valve is used to reverse the flow of refrigerant in a heat pump?
    • A. 

      Suction pressure valve

    • B. 

      Check valve

    • C. 

      Thermostatic expansion valve

    • D. 

      4-way solenoid valve

  • 25. 
    ___ is a unit of electromotive force.
    • A. 

      Kilowatt

    • B. 

      Microfarad

    • C. 

      Milliamps

    • D. 

      Volt

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