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ECE :: Electronic Devices and Circuits

Electronic Devices and Circuits - Section 1
Electronic Devices and Circuits - Section 2
Electronic Devices and Circuits - Section 3
Electronic Devices and Circuits - Section 4
Electronic Devices and Circuits - Section 5
Electronic Devices and Circuits - Section 6
Electronic Devices and Circuits - Section 7
Electronic Devices and Circuits - Section 8
Electronic Devices and Circuits - Section 9
Electronic Devices and Circuits - Section 10
Electronic Devices and Circuits - Section 11
Electronic Devices and Circuits - Section 12
Electronic Devices and Circuits - Section 13
Electronic Devices and Circuits - Section 14
Electronic Devices and Circuits - Section 15
Electronic Devices and Circuits - Section 16
Electronic Devices and Circuits - section-17
Electronic Devices and Circuits - Section-18

  1. A JFET operates in ohmic region when

    2. A.
    VGS = 0
    B.
    VGS is less than pinch off voltage
    C.
    VGS = is Positive
    D.
    VGS = VDS

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  2. In CE connection, the leakage current of a transistor is about

    3. A.
    10 x 10-9 A
    B.
    5 x 10-6 A
    C.
    200 x 10-6 A
    D.
    5 x 10-3 A

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  3. The early effect in a BJT is caused by

    4. A.
    fast turn on
    B.
    fast turn off
    C.
    large collector base reverse bias
    D.
    large emitter base forward bias

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  4. In a common emitter BJT amplifier, the maximum usable supply voltage is limited by

    5. A.
    avalanche Beakdown of Base-Emitter junction
    B.
    collector emitter breakdown voltage with base open(βVCEO)
    C.
    collector emitter breakdown voltage with emitter open(βVCEO)
    D.
    zener break down voltage of the emitter base junction

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  5. Assertion (A): In active region of CE output characteristics of BJT, collector current is nearly constant.

    Reason (R): Base current in CE connection is very small.

    6. A.
    Both A and R are true and R is correct explanation of A
    B.
    Both A and R are true but R is not a correct explanation of A
    C.
    A is true but R is false
    D.
    A is false but R is true

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  6. The temperature of cathode is increased from 2500K to 2600K. The increase in thermionic emission current is about

    7. A.
    0.1%
    B.
    4%
    C.
    50%
    D.
    150%

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  7. Consider the following statement: At finite temperature, magnetic dipoles in a material are randomly oriented giving low magnetization. When magnetic field H is applied, the magnetization?

    1. Increases with H
    2. Decreases with H
    3. Decreases with temp for constant H
    Which of the statement given above is/are correct?

    8. A.
    1
    B.
    2
    C.
    2, 3
    D.
    1 and 3

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  8. Ferrites have

    9. A.
    low copper loss
    B.
    low eddy current loss
    C.
    low resistivity
    D.
    higher specific gravity compared to iron

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  9. Eg is the band gap, A is pre-factor, k is Boltzmann constant? Which one of the following is the remaining grade of paper used in paper capacitor, besides the other two grade of paper-low and extra low loss?

    10. A.
    Strong dielectric
    B.
    Regular
    C.
    Rough
    D.
    High loss

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  10. Barkhausen criterion of oscillation is

    11. A.
    Aβ > 1
    B.
    Aβ = 1
    C.
    Aβ = < 1
    D.
    Aβ ≤ 1

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