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ECE :: Analog Electronics

  1. In a good voltage amplifier, its input impedance

  2. A.
    must be high compared to the resistance of the source
    B.
    must be low compared to the resistance of the source
    C.
    must be equal to the resistance of the source
    D.
    must be half the resistance of the source

  3. A non-inverting voltage feedback amplifier is a

  4. A.
    voltage amplifier
    B.
    current amplifier
    C.
    current to voltage converter
    D.
    voltage to current converter

  5. A Colpitt's oscillator uses

  6. A.
    a tapped inductor
    B.
    an inductor and two capacitors
    C.
    both (a) and (b)
    D.
    either (a) or (b)

  7. In every practical oscillator, the loop gain is slightly larger than unity and the amplitude of the oscillations is limited by the

  8. A.
    magnitude of the loop gain
    B.
    onset if non-linearity
    C.
    magnitude of gain of the amplifier
    D.
    feedback transmission factor

  9. IF amplifiers for radio receivers are often tuned to

  10. A.
    456 Hz
    B.
    456 kHz
    C.
    3456 MHz
    D.
    456 GHz

  11. In CE circuit the parameter f12 is very small.

  12. A.
    True
    B.
    False

  13. In which amplifier circuit is gate conductance negligible?

  14. A.
    JFET amplifier
    B.
    MOSFET amplifier
    C.
    Both JFET and MOSFET amplifier
    D.
    None of the above

  15. In figure VCEQ for each transistor is

  16. A.
    VCC
    B.
    0.5 VCC
    C.
    0.75 VCC
    D.
    0.25 VCC

  17. Which of the following combinations has no phase inversion of the signal?

  18. A.
    Two CE stages
    B.
    CE and CC stages
    C.
    Three CE stages
    D.
    CE stages and emitter follower

  19. Which of the following h parameters is an admittance?

  20. A.
    hie
    B.
    hre
    C.
    hfe
    D.
    hoe