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Electrical Engineering Materials - section-1
  1. On which of the following factors does the resistivity of a material depend ?

    2. A.

     Resistance of the conductor
    B.

     Area of the conductor section
    C.

     Length of the conductor
    D.

     All of the above

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  2. Piezoelectric materials serve as a source of ________ .

    3. A.

     Resonant waves
    B.

     Musical waves
    C.

     Microwaves
    D.

     Ultrasonic waves

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  3. The tiny block formed by the arrangement of a small group of atoms is called the

    4. A.

     Unit cell
    B.

     Space lattice
    C.

     Either A or B
    D.

     None of the above

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  4. The number of atoms per unit cell in B.C.C. structure is

    5. A.

     1
    B.

     2
    C.

     4
    D.

     8

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  5. Which of the following variety of copper has the best conductivity ?

    6. A.

     Induction hardened copper
    B.

     Hard drawn copper
    C.

     Pure annealed copper
    D.

     Copper containing traces of silicon

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  6. The kinetic energy of a bounded electron is

    7. A.

     Less than that of unbounded electron
    B.

     Greater than that of unbounded electron
    C.

     Equal to that of unbounded electron
    D.

     Infinite

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  7. Super conductivity can be destroyed by

    8. A.

     Adding impurities
    B.

     Reducing temperatures
    C.

     Application of magnetic field
    D.

     Any of the above

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  8. The conductivity of a conductor can be increased by

    9. A.

     Decreasing its temperature
    B.

     Increasing its temperature
    C.

     Decreasing its vibration
    D.

     Increasing its vibration

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  9. Mercury as an electric contact material is

    10. A.

     A liquid
    B.

     A metal
    C.

     A metal liquid
    D.

     A gas

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  10. ________ has the best damping properties.

    11. A.

     Diamond
    B.

     High speed steel
    C.

     Mild steel
    D.

     Cast iron

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