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ECE :: Analog Electronics

  1. In high frequency region, an amplifier behaves like a

  2. A.
    band pass filter
    B.
    low pass filter
    C.
    high pass filter
    D.
    any of the above

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  3. Class C operation finds application in

  4. A.
    RF power amplifiers
    B.
    frequency multipliers
    C.
    both (a) and (b)
    D.
    neither (a) nor (b)

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  5. In the circuit shown in the figure

  6. A.
    only red will glow
    B.
    only green will glow
    C.
    both red and green will glow
    D.
    none will glow

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  7. In a CE amplifier circuit the load resistance is open circuited. The output voltage will

  8. A.
    increase
    B.
    decrease
    C.
    become zero
    D.
    increase or decrease

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  9. Emitter follower is in which of following configuration.

  10. A.
    common Base
    B.
    common Emitter
    C.
    common collector
    D.
    common Base or common Emitter

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  11. Saturation region of a JFET is also known as

  12. A.
    source region
    B.
    analog region
    C.
    pinch off region
    D.
    ohmic region

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  13. Which junction transistor is preferred for high input and low output impedances?

  14. A.
    Common emitter
    B.
    Common base
    C.
    Common collector
    D.
    Any of the above

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  15. For operation of enhancement only N-channel MOSFET, value of gate voltage has to be

  16. A.
    zero
    B.
    low positive
    C.
    high negative
    D.
    high positive

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  17. Sweep voltage generators, sweep current generators, multivibrators and blocking oscillators can be combined as

  18. A.
    negative resistance oscillators
    B.
    tuned base tuned collector oscillators
    C.
    relaxation oscillators
    D.
    L-C tuned oscillators

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  19. 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 voltage multiplication is

  20. A.
    25
    B.
    50
    C.
    125
    D.
    250

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