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ECE :: Analog Electronics

  1. Which of the following components is essential for a voltage multiplier circuit?

  2. A.
    Resistor
    B.
    Inductor
    C.
    Capacitor
    D.
    Both (a) and (c)

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  3. Which of the following represents the equivalent circuit of a crystal for crystal oscillator?

  4. A.
    Figure A
    B.
    Figure B
    C.
    Figure C
    D.
    None of the above

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  5. The transistor specification number 2N refers to

  6. A.
    triac
    B.
    diac
    C.
    junction transistor
    D.
    FET with one gate

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  7. Stability factor for S is given by for a fixed bias

  8. A.
    1 + β
    B.
    1 - β
    C.
    1/β
    D.
    β - 1

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  9. In figure, the function of resistor R is

  10. A.
    to reduce ripples in the output
    B.
    to improve voltage regulation
    C.
    to limit the surge current
    D.
    either (a) or (c)

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  11. The phase angle of lead circuit is

  12. A.
    between 0 and -90°
    B.
    between 0 and +90°
    C.
    90°
    D.
    more than 90°

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  13. A generator with an internal resistance of 600 Ω drives an amplifier whose input resistance is 400 Ω. The generator's open circuit voltages is 1 mV; the amplifier develops 100mV across an 8kΩ load. The power gain is

  14. A.
    125
    B.
    250
    C.
    1125
    D.
    3125

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  15. The circuit of figure is

  16. A.
    clipper, sine wave clipped at - 2 V
    B.
    clamper
    C.
    clamper, sine wave clamped at zero V
    D.
    clipper, sine wave clipped at + 2 V

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  17. The upper end of the d.c. load line is called the __________ point and the lower end is the __________ point.

  18. A.
    cut off, saturation
    B.
    saturation, active
    C.
    saturation, cut off
    D.
    active saturation

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  19. In figure output impedance of amplifier is

  20. A.
    RE
    B.
    C.
    D.
    re + RE

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