Semiconductor Electronics: Materials, Devices And Simple Circuits

15 Questions | Total Attempts: 979

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Semiconductor Electronics: Materials, Devices And Simple Circuits

Time: 30 Minute


Questions and Answers
  • 1. 
    What is the possible number of crystal system?
    • A. 

      5

    • B. 

      7

    • C. 

      14

    • D. 

      16

  • 2. 
    With fall of temperature, the forbidden energy gap of a semiconductor:
    • A. 

      Increases

    • B. 

      Decreases

    • C. 

      Remains unchanged

    • D. 

      Sometimes increases and sometimes decreases

  • 3. 
    What would be the fundamental frequency in the ripple, if a half wave rectifier circuit is being operated from a 50 Hz mains frequency?
    • A. 

      25 Hz

    • B. 

      50 Hz

    • C. 

      70.7 Hz

    • D. 

      100 Hz

  • 4. 
    At absolute zero, Si acts as a:
    • A. 

      Non - metal

    • B. 

      Metal

    • C. 

      Insulator

    • D. 

      None of these

  • 5. 
    What is the equivalent resistance of the circuit across AB?
    • A. 

      4 Ω

    • B. 

      13 Ω

    • C. 

      4 Ω or 13 Ω

    • D. 

      4 Ω or 0 Ω

  • 6. 
    The graph shown represents the I – V characteristics of a Zener diode. Which part according to you operates as a voltage regulator?
    • A. 

      Ab

    • B. 

      Bc

    • C. 

      Cd

    • D. 

      De

  • 7. 
    For a transistor if the parameters β = 99, then the value of parameter α is:
    • A. 

      0.9

    • B. 

      0.99

    • C. 

      1

    • D. 

      9

  • 8. 
    In the ratio of concentration of electrons that of holes in a semiconductor is 7/5 and the ratio of currents is 7/4 then what is the ratio of their drift velocity?
    • A. 

      4/7

    • B. 

      5/8

    • C. 

      4/5

    • D. 

      5/4

  • 9. 
    What will be the output voltage of the amplifier, if in an npn transistor at common emitter configuration the current gain is given as β = 100.
    • A. 

      10-3 V

    • B. 

      10-1 V

    • C. 

      100 V

    • D. 

      10 V

  • 10. 
    In the given figure, the current through the Zener diode is:
    • A. 

      10 mA

    • B. 

      6.67 mA

    • C. 

      5 mA

    • D. 

      3.33 mA

  • 11. 
    The relation between α and β parameters of a transistor is given by:
    • A. 
    • B. 
    • C. 
    • D. 
  • 12. 
    In the figure of the circuit the output y becomes zero for the inputs:
    • A. 

      A = 1, B = 0, C = 0

    • B. 

      A = 0, B = 1, C = 1

    • C. 

      A = 0, B = 0, C = 0

    • D. 

      A = 1, B = 1, C = 0

  • 13. 
    The figure shows a logic gate circuit with two inputs A and B and the output Y. The voltage waveforms of A, B and Y are given: The logic gate is:
    • A. 

      NAND Gate

    • B. 

      OR Gate

    • C. 

      AND Gate

    • D. 

      NOR Gate

  • 14. 
    The circuit diagram shows a logic combination with the states of outputs X, Y and Z given for inputs P, Q, R and S all at state 1. When input P and R change to state 0 with inputs Q and S still at 1, the states of outputs X, Y and Z change to:
    • A. 

      1, 0, 0

    • B. 

      0, 1, 0

    • C. 

      0, 0, 1

    • D. 

      0, 1, 1

  • 15. 
    Two ideal diodes are connected to a battery as shown in the figure. The current supplied by the battery is:
    • A. 

      0.75 A

    • B. 

      Zero

    • C. 

      0.25 A

    • D. 

      0.5 A

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