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Electrical Engineering Materials - section-1
  1. A carbon resistor contains

    2. A.

     Carbon crystals
    B.

     Solid carbon granules
    C.

     Pulverized coal
    D.

     Finely divided carbon black.

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  2. Which of the following material is not a semiconductor ?

    3. A.

     Silica
    B.

     Germanium
    C.

     Selenium
    D.

     Gallium-arsenide

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  3. Which of the following materials is preferred for transmitting electrical energy over long distance ?

    4. A.

     Copper
    B.

     Aluminium
    C.

     Steel reinforced copper
    D.

     Steel reinforced aluminium

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  4. The forbidden gap in an insulator is

    5. A.

     Large
    B.

     Small
    C.

     Nil
    D.

     Any of the above

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  5. Platinum is used in

    6. A.

     Electrical contacts
    B.

     Thermocouple
    C.

     Heating element in high temperature furnace
    D.

     Grids of special purpose vacuum tubes
    E.

     All of the above

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  6. In a crystal, an atom vibrates at a frequency determined by

    7. A.

     The heat content of the crystal
    B.

     The temperature of the crystal
    C.

     The stiffness of the bonds it makes with neighbors
    D.

     All of the above

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  7. Due to which of the following reasons copper and aluminium are not used for heating elements ?

    8. A.

     Both have great tendency for oxidation
    B.

     Both have low melting point
    C.

     Very large length of wires will be required
    D.

     All of the above

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  8. Thermocouples are mainly used for the measurement of

    9. A.

     Temperature
    B.

     Resistance
    C.

     Eddy currents
    D.

     Coupling co-efficient

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  9. Which of the following high resistance materials has the highest operating temperature ?

    10. A.

     Kanthal
    B.

     Manganin
    C.

     Nichrome
    D.

     Eureka

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  10. The transition temperature of mercury is

    11. A.

     18.0°K
    B.

     9.22°K
    C.

     4.12°K
    D.

     1.14’K

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