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Heating and Welding - section-1
  1. Which of the following insulating materials was suitable for low temperature applications?

    2. A.

     Asbestos paper
    B.

     Diatomaceous earth
    C.

     80 percent magnesia
    D.

     Cork

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  2. By which of the following methods the temperature inside arcane can be varied?

    3. A.

     By disconnecting some of the heating elements
    B.

     By varying the operating voltage
    C.

     By varying the current through heating elements
    D.

     By any of the above method

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  3. Which of the following methods is used to control temperature in resistance furnaces?

    4. A.

     Variation of resistance
    B.

     Variation of voltage
    C.

     Periodical switching on and off of the supply
    D.

     All of the above methods

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  4. It is desirable to operate the arc furnaces at power factor of

    5. A.

     Zero
    B.

     0.707 lagging
    C.

     Unity
    D.

     0.707 leading

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  5. In an electric room heat convector the method of heating used is Resistance heating

    6. A.

     True
    B.

     False

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  6. Resistance variation method of temperature control is done by connecting resistance elements in

    7. A.

     Series
    B.

     Parallel
    C.

     Series-parallel connections
    D.

     All of the above ways

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  7. In heating the ferromagnetic material by induction heating, heat is produced due to

    8. A.

     Induced current flow through the charge
    B.

     Hysteresis loss taking place below Curie temperature
    C.

     Due to hysteresis loss as well as eddy current loss taking place in the charge
    D.

     None of the above factors

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  8. Which of the following is an advantage of heating by electricity?

    9. A.

     Quicker operation
    B.

     Higher efficiency
    C.

     Absence of flue gases
    D.

     All of the above

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  9. In a domestic cake baking oven the temperature is controlled by

    10. A.

     Voltage variation
    B.

     Thermostat
    C.

     Autotransformer
    D.

     Series-parallel operation

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  10. Which of the following will happen if the thickness of refractory wall of furnace is increased?

    11. A.

     Heat loss through furnace wall will increase
    B.

     Temperature inside the furnace will fall
    C.

     Temperature on the outer surface of furnace walls will drop
    D.

     Energy consumption will increase

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