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ECE :: Analog Electronics

  1. The noise figure of FET circuit is

  2. A.
    independent of the quiescent point
    B.
    dependent on the quiescent point only
    C.
    dependent on the triggering mechanism
    D.
    independent of all above

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  3. The circuit diagram shown in the figure consists of transistors in;

  4. A.
    parallel connection
    B.
    cascade connection
    C.
    darlington connection
    D.
    series connection

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  5. The encapsulation of transistor is necessary for

  6. A.
    preventing radio interference
    B.
    preventing photo-emission effects
    C.
    avoiding loss of free electrons
    D.
    mechanical ruggedness

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  7. The circuit of figure is called

  8. A.
    current mirror
    B.
    voltage mirror
    C.
    impedance inversion
    D.
    phase splitting

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  9. In CE approximately, the active region is where the collector curves are

  10. A.
    almost horizontal
    B.
    almost vertical
    C.
    inclined at 45°
    D.
    inclined at 60°

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  11. In a transistor leakage current mainly depends on

  12. A.
    doping of base
    B.
    size of emitter
    C.
    rating of transistor
    D.
    temperature

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  13. In a CB amplifier the maximum efficiency could be

  14. A.
    99%
    B.
    85%
    C.
    50%
    D.
    25%

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  15. Assertion (A): As per Miller theorem a capacitance C from input to output appears as a much larger capacitance across input terminals

    Reason (R): In a lag network the output voltage appears across capacitor

  16. 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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  17. When a transistor is connected in common emitter mode, it with have

  18. A.
    negligible input resistance and high output resistance
    B.
    high input resistance and low output resistance
    C.
    medium input resistance and high output resistance
    D.
    low input resistance as well as output resistance

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  19. In the equivalent circuit of figure voltage gain is

  20. A.
    a
    B.
    C.
    D.

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