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Electrical Engineering Materials - section-1
  1. The carbon percentage is least in

    2. A.

     low carbon steel
    B.

     wrought iron
    C.

     cast iron
    D.

     malleable iron

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  2. Addition of 0.3 to 4.5% silicon to iron __________ the electrical resistivity of iron.

    3. A.

     Increases
    B.

     Decreases
    C.

     Does not change
    D.

     Change

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  3. Due to which of the following reasons aluminium does not corrode in atmosphere ?

    4. A.

     Aluminium is a noble metal
    B.

     Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium
    C.

     No reaction with oxygen occurs ft Any of the above
    D.

     All of the above

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  4. In thermocouples which of the following pairs is commonly used ?

    5. A.

     Copper-constantan
    B.

     Aluminium-tin
    C.

     Silver-German silver
    D.

     Iron-steel

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  5. If the resistance of a conductor does not vary in accordance with Ohm’s law it is known as

    6. A.

     non-linear conductor
    B.

     reverse conductor
    C.

     bad-conductor
    D.

     non-conductor

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  6. Surface resistance of an insulating material is reduced due to the

    7. A.

     Smoky and dirty atmosphere
    B.

     Humidity in the atmosphere
    C.

     Both A and B
    D.

     Neither A nor B

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  7. Due to which of the following fact, in India, aluminium is replacing copper ?

    8. A.

     Aluminium is more ductile and malleable than copper
    B.

     Aluminium is available in plenty, cheaper and lighter than copper
    C.

     Aluminium has lower resistivity than that of copper
    D.

     Aluminium has less temperature co-efficient than copper

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  8. Which of the following is an advantage of stranded conductor over equivalent single conductor ?

    9. A.

     Less liability to kink
    B.

     Greater flexibility
    C.

     Less liability to break
    D.

     All of the above

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  9. The conductivity of a metal is determined by

    10. A.

     The electronic concentration and the mobility of the free electrons
    B.

     The number of valence electrons per atom
    C.

     Either A or B
    D.

     None of the above

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  10. Steel wire is used as

    11. A.

     Overhead telephone wire
    B.

     Earth wire
    C.

     Core wire of ACSR
    D.

     All of the above

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