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EEE :: Heating and Welding

Heating and Welding - section-1
  1. The electrode of a direct arc furnace is made of

    2. A.

     Tungsten
    B.

     Graphite
    C.

     Silver
    D.

     Copper

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  2. In an electric press mica is used

    3. A.

     As an insulator
    B.

     As a device for power factor improvement
    C.

     For dielectric heating
    D.

     For induction heating

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  3. In a resistance furnace the atmosphere is

    4. A.

     Oxidizing
    B.

     Deoxidizing
    C.

     Reducing
    D.

     Neutral

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  4. By the use of which of the following, high frequency power supply for induction furnaces can be obtained?

    5. A.

     Coreless transformers
    B.

     Current transformers
    C.

     Motor-generator set
    D.

     Multiphase transformer

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  5. The temperature inside a furnace is usually measured by which of the following?

    6. A.

     Optical pyrometer
    B.

     Mercury thermometer
    C.

     Alcohol thermometer
    D.

     Any of the above

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  6. Radiant heating is used for which of the following?

    7. A.

     Annealing of metals
    B.

     Melting of ferrous metals
    C.

     Heating of liquids in electric kettle
    D.

     Drying of paints and varnishes

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  7. Induction furnaces are employed for which of the following?

    8. A.

     Heat treatment of castings
    B.

     Heating of insulators
    C.

     Melting aluminium
    D.

     None of the above

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

    9. A.

     Insulating materials
    B.

     Conducting materials which are magnetic
    C.

     Conducting materials which are nonmagnetic
    D.

     Conducting materials which may or may not be magnetic

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  9. In electric press, mica is used because it is _______ conductor of heat but/and________ conductor of electricity.

    10. A.

     bad, good
    B.

     bad, bad
    C.

     good, bad
    D.

     good, good

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

    11. A.

     Arc heating
    B.

     Resistance heating
    C.

     Induction heating
    D.

     Dielectric heating

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