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Heating and Welding - section-1
  1. Which of the following is an advantage of eddy current heating?

    2. A.

     The amount of heat generated can be controlled accurately
    B.

     Heat at very high rate can be generated
    C.

     The area of the surface over which heat is produced can be accurately controlled
    D.

     All of the above

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  2. Properly of low temperature coefficient of heating element is desired due to which of the following reasons?

    3. A.

     To avoid initial rush of current
    B.

     To avoid change in kW rating with temperature
    C.

     Both (A) and (B)
    D.

     Either (A) or (B)

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  3. Heat is transferred simultaneously by condition, convection and radiation

    4. A.

     Inside boiler furnaces
    B.

     During melting of ice
    C.

     Through the surface of the insulted pipe carrying steam
    D.

     From refrigerator coils to freezer of a refrigerator

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  4. For radiant heating around 2250°C, the heating elements are made of

    5. A.

     Copper alloy
    B.

     Carbon
    C.

     Tungsten alloy
    D.

     Stainless steel alloy

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  5. Hysteresis loss and eddy current loss are used in

    6. A.

     Induction heating of steel
    B.

     Dielectric heating
    C.

     Induction heating of brass
    D.

     Resistance heating

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  6. Which of the following methods of heating is not dependent on the frequency of supply?

    7. A.

     Induction heating
    B.

     Dielectric heating
    C.

     Electric resistance heating
    D.

     All of the above

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  7. In arc furnace the function of choke is

    8. A.

     To stabilize the arc
    B.

     To improve power factor
    C.

     To reduce severity of the surge
    D.

     None of the above

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  8. Induction heating takes place it which of the following?

    9. A.

     Insulating materials
    B.

     Conducting materials which are magnetic
    C.

     Conducting materials which are non-magnetic
    D.

     Conducting materials which may or may not be magnetic

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  9. ________ has the highest value of thermal conductivity.

    10. A.

     Copper
    B.

     Aluminium
    C.

     Brass
    D.

     Steel

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  10. Which of the following has the highest value of thermal conductivity?

    11. A.

     Water
    B.

     Steam
    C.

     Solid ice
    D.

     Melting ice

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