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  • Question
  • 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)

  • Correct Answer
  • IEp >> IEn 

    Explanation
    Emitter is p-type in p-n-p transistor.

    Therefore holes are majority carriers.


    Electronic Devices and Circuits problems


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    • 1. 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
    • 2. 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
    • Discuss
    • 3. 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
    • 4. The inverse of given Laplace transform is


    • Options
    • A. sin t
    • B. cos t
    • C. et
    • D. e2t
    • Discuss
    • 5. 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
    • 6. 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
    • 7. At room temperature the current in an intrinsic semiconductor is due to

    • Options
    • A. holes
    • B. electrons
    • C. ions
    • D. holes and electrons
    • Discuss
    • 8. 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
    • 9. In a bipolar transistor which current is largest

    • Options
    • A. collector current
    • B. base current
    • C. emitter current
    • D. base current or emitter current
    • Discuss
    • 10. Assertion (A): The conductivity of p type semiconductor is higher than that of intrinsic semiconductor.

      Reason (R): The addition of donor impurity creates additional energy levels below conduction band.


    • 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


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