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AllInfoHub – MCQ Practice

Electronic Devices and Circuits – Multiple Choice Questions (MCQs)

  1. 73. The phenomenon of 'Early Effect' in BJTs is related to:

    • A. Base width modulation
    • B. Thermal runaway
    • C. Collector breakdown
    • D. Emitter current variation

  2. 74. A push-pull amplifier is primarily used to:

    • A. Increase voltage gain
    • B. Reduce distortion
    • C. Increase current gain
    • D. Improve linearity

  3. 75. Which class of amplifier operates with maximum efficiency but high distortion?

    • A. Class A
    • B. Class B
    • C. Class AB
    • D. Class C

  4. 76. The current gain (β) of a BJT is typically in the range of:

    • A. 0.1 to 1
    • B. 1 to 10
    • C. 10 to 500
    • D. 500 to 1000

  5. 77. A diode's reverse recovery time is significant in applications involving:

    • A. DC circuits
    • B. Low frequency AC
    • C. High frequency switching
    • D. Power rectification

  6. 78. The drift current in a semiconductor is due to:

    • A. Diffusion of carriers
    • B. Electric field
    • C. Temperature gradient
    • D. Light

  7. 79. The diffusion current in a semiconductor is due to:

    • A. Electric field
    • B. Concentration gradient of carriers
    • C. Temperature gradient
    • D. Light

  8. 80. The power dissipation in a BJT is highest when it is operating in the:

    • A. Cut-off region
    • B. Saturation region
    • C. Active region
    • D. Breakdown region

  9. 81. The stability factor 'S' of a biasing circuit indicates:

    • A. Its sensitivity to temperature changes
    • B. Its ability to amplify
    • C. Its power efficiency
    • D. Its noise rejection

  10. 82. Which type of FET is typically used in switching applications due to its low ON-resistance?

    • A. JFET
    • B. Depletion-type MOSFET
    • C. Enhancement-type MOSFET
    • D. MESFET

  11. 83. The input characteristics of a BJT usually plot:

    • A. Ic vs Vce
    • B. Ib vs Vbe
    • C. Vce vs Ic
    • D. Vbe vs Ic

  12. 84. The output characteristics of a BJT usually plot:

    • A. Ic vs Vce
    • B. Ib vs Vbe
    • C. Vbe vs Ic
    • D. Vce vs Ib

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