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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

  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)

  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

  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

  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

  11. Saturation region of a JFET is also known as

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

  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

  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

  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

  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