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  • Question
  • An amplifier without feedback has a voltage gain of 50, input resistance of 1 k? and output resistance of 2.5 k?. The input resistance of the current shunt -ve feedback amplifier using the above amplifier with a feedback factor of 0.2 is


  • Options
  • A. 1/11 k?
  • B. 1/5 k?
  • C. 5 kW
  • D. 11 kW

  • Correct Answer
  • 1/11 k? 

    Explanation
    Input Resistance with feedback for current shunt, An amplifier without feedback has a voltage gain of 50, input resistance of 1 k? and output resistan.

    Electronic Devices and Circuits problems


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    • 1. An increase in temperature increases the width of depletion layer.

    • Options
    • A. True
    • B. False
    • Discuss
    • 2. Calculate the stability factor and change in IC from 25°C to 100°C for, ? = 50, RB/ RE = 250, ?IC0 = 19.9 nA for emitter bias configuration.

    • Options
    • A. 42.53, 0.85 ?A
    • B. 40.91, 0.58 ?A
    • C. 40.91, 0.58 ?A
    • D. 41.10, 0.39 ?A
    • Discuss
    • 3. Assertion (A): The reverse saturation current in a semiconductor diode is 4nA at 20°C and 32 nA at 50°C.

      Reason (R): The reverse saturation current in a semiconductor diode doubles for every 10°C rise in temperature.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not a correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
    • Discuss
    • 4. A p-n junction diode has

    • Options
    • A. low forward and high reverse resistance
    • B. a non-linear v-i characteristics
    • C. zero forward current till the forward voltage reaches cut in value
    • D. all of the above
    • Discuss
    • 5. A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is

    • Options
    • A. 100
    • B. 99
    • C. 1.01
    • D. 0.99
    • Discuss
    • 6. Work function is the maximum energy required by the fastest electron at 0 K to escape from the metal surface.

    • Options
    • A. True
    • B. False
    • Discuss
    • 7. Crossover distortion behaviour is characteristic of

    • Options
    • A. class A O/P stage
    • B. class B O/P stage
    • C. class AB output stage
    • D. common pulse O/P state
    • Discuss
    • 8. In which of these is reverse recovery time nearly zero?

    • Options
    • A. Zener diode
    • B. Tunnel diode
    • C. Schottky diode
    • D. PIN diode
    • Discuss
    • 9. The v-i characteristics of a FET is shown in figure. In which region is the device biased for small signal amplification

    • Options
    • A. AB
    • B. BC
    • C. CD
    • D. BD
    • Discuss
    • 10. In which region of a CE bipolar transistor is collector current almost constant?

    • Options
    • A. Saturation region
    • B. Active region
    • C. Breakdown region
    • D. Both saturation and active region
    • Discuss


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