Analog And Digital Electronics

40 Questions | Total Attempts: 301

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Digital Electronics Quizzes & Trivia

Questions and Answers
  • 1. 
    The majority carriers in the emitter of a PNP transistors are
    • A. 

      Holes

    • B. 

      Free electrons

    • C. 

      Trivalent atoms

    • D. 

      Pentavalent atoms

  • 2. 
    A LED produces light when-
    • A. 

      Unbiased

    • B. 

      Reverse biased

    • C. 

      Foreward biased

    • D. 

      None of the above

  • 3. 
    A 2 transistor class B power amplifier is commonly called-
    • A. 

      Push-pull

    • B. 

      Dual

    • C. 

      Differential

    • D. 

      None of these

  • 4. 
    Negative feedback is an amplifier is -
    • A. 

      Reduced gain

    • B. 

      Increased noise

    • C. 

      Increased frequency and phase

    • D. 

      Reduced bandwidth

  • 5. 
    Maximum efficiency of transformer coupled class A power amplifier is-
    • A. 

      78.50%

    • B. 

      50%

    • C. 

      25%

    • D. 

      100%

  • 6. 
    The maximum efficiency of a push pull class B power amplifier is-
    • A. 

      78.50%

    • B. 

      50%

    • C. 

      25%

    • D. 

      None of these

  • 7. 
    A CE Transistor power amplifier operates with quiescent values of Vcq= 6V and Icq=50mA. The output signal voltage varies from 1 to 11V and the output current varies from 10 to 90 mA. Find the DC input power to the transistor-
    • A. 

      0.3W

    • B. 

      0.5W

    • C. 

      1W

    • D. 

      None of these

  • 8. 
    A CE Transistor power amplifier operates with quiescent values of Vcq= 6V and Icq=50mA. The output signal voltage varies from 1 to 11V and the output current varies from 10 to 90 mA. Find the AC output power-
    • A. 

      0.1W

    • B. 

      0.3W

    • C. 

      0.5W

    • D. 

      None of these

  • 9. 
    A CE Transistor power amplifier operates with quiescent values of Vcq= 6V and Icq=50mA. The output signal voltage varies from 1 to 11V and the output current varies from 10 to 90 mA. Find the efficiency-
    • A. 

      33.30%

    • B. 

      35%

    • C. 

      25%

    • D. 

      50%

  • 10. 
    Audio frequency range-
    • A. 

      20 Hz to 20 KHz

    • B. 

      3 Hz to 30 KHz

    • C. 

      50 MHz

    • D. 

      None of the above

  • 11. 
    The input resistance of an ideal voltage amplifier is
    • A. 

      Infinity

    • B. 

      Zero

    • C. 

      Unity

    • D. 

      None of the above

  • 12. 
    The output resistance of an ideal voltage amplifier is
    • A. 

      Infinity

    • B. 

      Zero

    • C. 

      Unity

    • D. 

      None of the above

  • 13. 
    The input resistance of an ideal current amplifier is
    • A. 

      Infinity

    • B. 

      Zero

    • C. 

      Unity

    • D. 

      None of the above

  • 14. 
    The output resistance of an ideal current amplifier is
    • A. 

      Infinity

    • B. 

      Zero

    • C. 

      Unity

    • D. 

      None of the above

  • 15. 
    To work as a linear amplifier, a transistor must operate in-
    • A. 

      The active region

    • B. 

      The saturation region

    • C. 

      Cut off region

    • D. 

      None of these

  • 16. 
    Feedback always increases the gain of an amplifier.
    • A. 

      True

    • B. 

      False

  • 17. 
    (21.625)10 = ( ) 2 ?
    • A. 

      10001.001

    • B. 

      10000.1

    • C. 

      10101.101

    • D. 

      10011.111

  • 18. 
    (101111.11) 2 = ( ) 10 ?
    • A. 

      52.85

    • B. 

      49.75

    • C. 

      42.25

    • D. 

      47.75

  • 19. 
    (125.201) 10 = ( ) 8 ?
    • A. 

      178.52892

    • B. 

      175.14672

    • C. 

      176.11992

    • D. 

      174.25922

  • 20. 
    (125.201) 10 = ( ) 16 ?
    • A. 

      7D.3374B

    • B. 

      7A.1052B

    • C. 

      7B.0704C

    • D. 

      7C.3387A

  • 21. 
    How many binary digits are required to count to 10010?
    • A. 

      7

    • B. 

      2

    • C. 

      3

    • D. 

      100

  • 22. 
    The sum of 11101 + 10111 equals ________.
    • A. 

      110011

    • B. 

      100001

    • C. 

      110100

    • D. 

      100100

  • 23. 
    A binary number's value changes most drastically when the ________ is changed.
    • A. 

      MSB

    • B. 

      Frequency

    • C. 

      LSB

    • D. 

      Duty cycle

  • 24. 
    The octal numbering system:
    • A. 

      Simplifies tasks

    • B. 

      Groups binary numbers in groups of 4

    • C. 

      Saves time

    • D. 

      Simplifies tasks and saves time

  • 25. 
    Hexadecimal letters A through F are used for decimal equivalent values from:
    • A. 

      1 through 6

    • B. 

      9 through 14

    • C. 

      10 through 15

    • D. 

      11 through 17

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