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  • Question

  • In a CE amplifier the input impedance is equal to the ratio of


  • Options
  • A. ac base voltage to ac base current
  • B. ac base voltage to ac emitter current
  • C. ac emitter voltage to ac collector current
  • D. ac collector voltage to ac collector current

  • Correct Answer
  • ac base voltage to ac base current 

    Explanation
    Input is applied to base with emitter grounded. The input impedance is the ratio of ac base voltage to ac base current.

    Analog Electronics problems

    Search Results

    • 1. Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier shown below would be

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. Consider the following statements : A clamper circuit

      1. adds or subtracts a dc voltage to a waveform
      2. does not change the waveform
      3. amplifiers the waveform
      Which are correct?

    • Options
    • A. 1, 2
    • B. 1, 3
    • C. 1, 2, 3
    • D. 2, 3
      • Discuss
    • 3. An exponential amplifier has diode in feedback path.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. In figure The minimum and maximum load currents are

    • Options
    • A. 0 and 60 mA
    • B. 0 and 120 mA
    • C. 10 mA and 60 mA
    • D. 10 mA and 120 mA
      • Discuss
    • 5. A bridge rectifier circuit has input of 50 Hz frequency. The load resistance is RL and filter capacitance is C. For good output wave shape, the time constant RLC should be at least equal to

    • Options
    • A. 10 ms
    • B. 20 ms
    • C. 50 ms
    • D. 100 ms
      • Discuss
    • 6. A CB amplifier has re = 6 ?, RL = 600 ? and a = 0.98. The voltage gain is

    • Options
    • A. 100
    • B. 600 x 0.98
    • C. 98
    • D. 6
      • Discuss
    • 7. A stepper motor is

    • Options
    • A. a two phase induction motor
    • B. is a kind of rotating amplifier
    • C. is an electromagnetic transducer used to convert an angular position of shaft into electrical signal
    • D. is an electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis
      • Discuss
    • 8. The phase margin and damping ratio have no relation.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. In the given figure the input is x(t) = A sin ?t. The steady state output y(t) =

    • Options
    • A. A sin (?t + ?) where ? = tan-1 |G(j?)|
    • B. |G(j?)| A sin [?t + ?G(j?)]
    • C. |G(j?)| A sin [2?t + ?G(j?)]
    • D. A G(j?) sin [?t + ?G(j?)]
      • Discuss
    • 10. In the given figure x6 =

    • Options
    • A. de(ax1 + bx2 + cx3)
    • B. (a + b + c) (x1 + x2 + x3) (d + e)
    • C. (ax1 + bx2 + cx3) (d + e)
    • D. a b c d e (x1 + x2 + x3)
      • Discuss

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