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Electrical Engineering Materials - section-1
  1. The superconductivity is due to

    2. A.

     The crystal structure having no atomic vibration at 0°K
    B.

     All electrons interact in the super-conducting state
    C.

     The electrons jump into nucleus at 0°K
    D.

     None of the above

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  2. Overhead telephone wires are made of

    3. A.

     aluminium
    B.

     steel
    C.

     ACSR conductors
    D.

     Copper

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  3. _________ is most commonly used for making magnetic recording tape

    4. A.

     Silver nitrate
    B.

     Ferric oxide
    C.

     Small particles of iron
    D.

     Silicon-iron

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  4. A good electric contact material should have all of the following properties except

    5. A.

     High resistivity
    B.

     High resistance to corrosion
    C.

     Good thermal conductivity
    D.

     High melting point

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  5. Non-linear resistors

    6. A.

     Produce harmonic distortion
    B.

     Follows Ohm’s law at low temperatures only
    C.

     Result in non-uniform heating
    D.

     None of the above

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  6. The covalent bond is formed by

    7. A.

     Transfer of electrons between atoms
    B.

     Sharing of electrons between atoms
    C.

     Sharing of variable number of electrons by a variable number of atoms
    D.

     None of the above

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  7. The formula __________ determines the number of electrons that can be accommodated in any level.

    8. A.

     2n2
    B.

     4n2
    C.

     2n3
    D.

     4ns

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  8. Carbon electrodes are not used in

    9. A.

     GLS lamps
    B.

     Electric arc furnace
    C.

     Dry cells
    D.

     Cinema projectors

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  9. At transition temperature the value of critical field is

    10. A.

     Zero
    B.

     Negative real value
    C.

     Positive real value
    D.

     Complex value

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  10. Solder is an alloy of

    11. A.

     Copper and aluminium
    B.

     Tin and lead
    C.

     Nickel, Copper and zinc
    D.

     Silver, copper and lead

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