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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)

  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

  5. The transistor specification number 2N refers to

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

  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

  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)

  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°

  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

  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

  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

  19. In figure output impedance of amplifier is

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