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Electrical Engineering Materials - section-1
  1. The conductors have transport phenomena of electrons due to

    2. A.

     Electric field
    B.

     Magnetic field
    C.

     Electromagnetic field
    D.

     None of the above

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  2. Is a negatively charged particle present in an atom.

    3. A.

     Proton
    B.

     Neutron
    C.

     Electron
    D.

     None of the above

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  3. The resistivity of a metal is a function of temperature because

    4. A.

     The amplitude of vibration of the atoms varies with temperature
    B.

     The electron density varies with temperature
    C.

     The electron gas density varies with temperature
    D.

     None of the above

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  4. _______ is a hard solder.

    5. A.

     Tin-lead
    B.

     Tin-silver-lead
    C.

     Copper-zinc
    D.

     None of the above

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  5. Selenium is _____ semiconductor.

    6. A.

     Extrnisic
    B.

     Intmisic
    C.

     N-type
    D.

     P-type

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  6. The structure sensitive property of a super conductor is

    7. A.

     Critical magnetic field
    B.

     Transition temperature
    C.

     Critical current density
    D.

     None of the above

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  7. Spark plug makes use of which of the following materials for insulation ?

    8. A.

     Porcelain
    B.

     Slate
    C.

     Asbestos
    D.

     Glass

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  8. An H.R.C. fuse is

    9. A.

     A ceramic body having metal and caps
    B.

     A wire of platinum
    C.

     A heavy cross-section of copper or aluminium
    D.

     A ceramic tube having carbon rod inside it

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  9. Which of the following materials is used for making coils of standard resistances ?

    10. A.

     Copper
    B.

     Nichrome
    C.

     Platinum
    D.

     Manganin

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  10. The minority carrier concentration is largely a function of

    11. A.

     Forward biasing voltage
    B.

     Reverse biasing voltage
    C.

     Temperature
    D.

     The amount of doping

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