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ECE :: Analog Electronics

  1. In the case of the circuit shown in the figure, the collector current IC will be, if β = 100, VBE = 0.7 V, ICO = 0.1 βA at 20°C

  2. A.
    2.26 mA
    B.
    1.85 mA
    C.
    0.357 mA
    D.
    0.185 mA

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  3. A three-section RC phase shift oscillator has R = 10K ohms and C = 0.001 μF. The frequency of oscillations is

  4. A.
    1.1 kHz
    B.
    2.5 kHz
    C.
    3.3 kHz
    D.
    6.5 kHz

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  5. The circuit of figure is

  6. A.
    positive clipper
    B.
    negative clipper
    C.
    combination clipper
    D.
    either (a) or (b)

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  7. Assertion (A): Electric coupling, magnetic coupling and ground loop can cause unwanted high frequency oscillations.

    Reason (R): Hartley oscillator uses a tapped inductor

  8. A.
    Both A and R are correct and R is correct explanation for A
    B.
    Both A and R are correct but R is not correct explanation for A
    C.
    A is correct R is wrong
    D.
    A is wrong R is correct

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  9. In figure VCE (sat) = 0.1 V. Then IC (sat) =

  10. A.
    10 mA
    B.
    20 mA
    C.
    30 mA
    D.
    40 mA

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  11. Power transistors are invariably provided with

  12. A.
    soldered connections
    B.
    heat sink
    C.
    metallic casing
    D.
    none of the above

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  13. Assertion (A): The ac load line is different from dc load line

    Reason (R): The ac load resistance seen by collector and emitter is different from dc load resistance

  14. A.
    Both A and R are correct and R is correct explanation for A
    B.
    Both A and R are correct but R is not correct explanation for A
    C.
    A is correct R is wrong
    D.
    A is wrong R is correct

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  15. In a class C operation VCC = 40 V and VCE(sat) = 0.4 V. The efficiency is

  16. A.
    90%
    B.
    49.5%
    C.
    1%
    D.
    0.5%

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  17. The circuit shown in figure will

  18. A.
    oscillate at 456 kHz
    B.
    oscillate at 228 kHz
    C.
    oscillate at microwave frequency
    D.
    not oscillate

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  19. The absolute values of pinch-off voltage and gate-source cut-off voltage are

  20. A.
    nearly zero
    B.
    complementary to each other
    C.
    never equal
    D.
    equal

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