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  • Question

  • A zener diode is used in


  • Options
  • A. voltage regulator circuit
  • B. amplifier circuits
  • C. both voltage regulator and amplifier circuit
  • D. none of the above

  • Correct Answer
  • voltage regulator circuit 

    Explanation
    Zener diode is used only in voltage regulator circuits.

    Electronic Devices and Circuits problems

    Search Results

    • 1. Consider the common emitter amplifier shown below with the following circuit parameters: ? = 100, gm = 0.3861 A/V, r0 = ? rp = 259 ?, Rs = 1 k?, RB = 93 k?, RC = 250 ?, RL = 1 kW, C1 = ? and C2 = 4.7mF.

      The resistance seen by the source Vs is

    • Options
    • A. 258 ?
    • B. 1258 ?
    • C. 93 k?
    • D. ?
      • Discuss
    • 2. The inverse of given Laplace transform is


    • Options
    • A. sin t
    • B. cos t
    • C. et
    • D. e2t
      • Discuss
    • 3. Find Vx Vy Vz

    • Options
    • A. Vx = -6 Vy = 3 Vz = -3
    • B. Vx = -6 Vy = -3 Vz = 1
    • C. Vx = 6 Vy = 3 Vz = 3
    • D. Vx = 6 Vy = 1 Vz = 3
      • Discuss
    • 4. In the circuit shown, in switch S is open for a long time and is closed at t = 0. The current i(t) for t ? 0+ is

    • Options
    • A. i(t) = 0.5 - 0.125e-1000t A
    • B. i(t) = 1.5 - 0.125e-1000t A
    • C. i(t) = 0.5 - 0.5e-1000t A
    • D. i(t) = 0.375e-1000t A
      • Discuss
    • 5. Denominator polynomial of a transfer function of certain network is:
      s3 + s2 + 2s + 24
      Then the network is:

    • Options
    • A. stable
    • B. oscillatory
    • C. unstable
    • D. depends on numerator polynomial
      • Discuss
    • 6. In an n-p-n transistor, the majority carriers in the base are

    • Options
    • A. electrons
    • B. holes
    • C. both holes and electrons
    • D. either holes or electrons
      • Discuss
    • 7. In p-n-p transistor the current IE has two components viz. IEP due to injection of holes from p-region to n-region and IE due to injection of electrons from n-region to p-region. Then

    • Options
    • A. IEp and IEn are almost equal
    • B. IEp >> IEn
    • C. IEn >> IEp
    • D. either (a) or (c)
      • Discuss
    • 8. The amount of photoelectric emission current depends on

    • Options
    • A. frequency of incident radiation
    • B. intensity of incident radiation
    • C. both frequency and intensity of incident radiation
    • D. none of the above
      • Discuss
    • 9. At room temperature the current in an intrinsic semiconductor is due to

    • Options
    • A. holes
    • B. electrons
    • C. ions
    • D. holes and electrons
      • Discuss
    • 10. In the circuit of figure the function of resistor R and diode D are

    • Options
    • A. to limit the current and to protect LED against over voltage
    • B. to limit the voltage and to protect LED against over current
    • C. to limit the current and protect LED against reverse breakdown voltage.
    • D. none of the above.
      • Discuss

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