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  • Question
  • Consider the following statement
    If an electric field is applied to an n type semiconductor bar, the electrons and holes move in opposite directions due to their opposite charges. The net currents is

    1. both due to electrons and holes with electrons as majority carriers
    2. sum of hole and electron currents
    3. difference between electron and hole currents.
    Which of above statements are correct?


  • Options
  • A. 1 only
  • B. 1 and 2
  • C. 2 only
  • D. 3 only

  • Correct Answer
  • 1 and 2 

    Explanation
    The net current is sum of currents due to holes and electrons.

    In n type materials, electrons are majority carriers.


    More questions

    • 1. The output frequency of a cycloconverter can be changed by changing the firing angle.

    • Options
    • A. True
    • B. False
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    • 2. Most of the memory chips in static RAM

    • Options
    • A. do not require any supply
    • B. need 2 V supply
    • C. need 5 V supply
    • D. need 12 V supply
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    • 3. In crystalline solids, atoms are stacked in a regular manner.

    • Options
    • A. True
    • B. False
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    • 4. The classes of solid dielectrics are

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    • A. A, B, C, D, E, F, H
    • B. A E B F H C D
    • C. Y A E B F H C
    • D. A E B F H C
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    • 5. The unit for mmf is

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    • A. A
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    • 6. In a single phase full wave regulator, the firing angles in the positive and negative half cycles are generally

    • Options
    • A. equal
    • B. different
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    • 7. The real part of complex dielectric constant and tan? for a dielectric are 2.1 and 5 x 10-4 at 100 Hz respectively. The imaginary part of dielectric constant at 100 Hz is

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    • A. 1.05 x 10-3
    • B. 2.1 x 10-3
    • C. 5 x 10-3
    • D. 1.05 x 10-2
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    • 8. The units for ?r are

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    • A. Farads
    • B. Farads/m
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    • 9. Tesla is a unit of

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    • 10. In a receiver, which of the following device has IF input but RF output?

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    • A. Demodulator
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