Analog And Digital Electronics

40 Questions

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Digital Electronics Quizzes & Trivia

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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

  • 26. 
    Digital electronics is based on the ________ numbering system.
    • A. 

      Decimal

    • B. 

      Binary

    • C. 

      Octal

    • D. 

      Hexadecimal

  • 27. 
    An informational signal that makes use of binary digits is considered to be:
    • A. 

      Solid state

    • B. 

      Digital

    • C. 

      Analog

    • D. 

      Nonoscillating

  • 28. 
    When using the repeated division by 2 method of converting from decimal to binary, one must write the first remainder as the:
    • A. 

      MSB

    • B. 

      MSB, provided the following sequence of remainders are written in descending order until the final remainder is achieved.

    • C. 

      LSB

    • D. 

      LSB, provided the final remainder is used to replace the original LSB, which is then moved to the MSB position.

  • 29. 
    The output of a logic gate is 1 when all its inputs are at logic 0. the gate is either
    • A. 

      A NAND or an EX-OR

    • B. 

      An OR or an EX-NOR

    • C. 

      An AND or an EX-OR

    • D. 

      A NOR or an EX-NOR

  • 30. 
    The code where all successive numbers differ from their preceding number by single bit is
    • A. 

      Binary code

    • B. 

      BCD

    • C. 

      Excess – 3

    • D. 

      Gray

  • 31. 
    In a positive logic system, logic state 1 corresponds to
    • A. 

      Positive voltage

    • B. 

      Higher voltage level

    • C. 

      Zero voltage level

    • D. 

      Lower voltage level

  • 32. 
    The result of adding hexadecimal number A6 to 3A is
    • A. 

      DD

    • B. 

      E0

    • C. 

      F0

    • D. 

      EF

  • 33. 
    What does a decimal number represents?
    • A. 

      Quality

    • B. 

      Quantity

    • C. 

      Position

    • D. 

      None of these

  • 34. 
    A digit in base R will have a range from
    • A. 

      1 to R-1

    • B. 

      0 to R-1

    • C. 

      1 to R+1

    • D. 

      0 to R+1

  • 35. 
    ASCII code is required for representing more than ________ characters
    • A. 

      16

    • B. 

      8

    • C. 

      64

    • D. 

      32

  • 36. 
    What will be the result in BCD form if two binary numbers 599 and 984 are added ?
    • A. 

      1583

    • B. 

      8513

    • C. 

      8421

    • D. 

      None of these

  • 37. 
    The MSB of _____________ is same as the MSB of the corresponding Gray code
    • A. 

      Alphanumeric code

    • B. 

      Excess-3 code

    • C. 

      Binary code

    • D. 

      Gray code

  • 38. 
    DeMorgan’s first theorem shows the equivalence of
    • A. 

      OR gate and Exclusive OR gate

    • B. 

      NOR gate and Bubbled AND gate

    • C. 

      NAND gate and NOT gate

    • D. 

      None of these

  • 39. 
    (734)8 =(? )16
    • A. 

      C 1 D

    • B. 

      D C 1

    • C. 

      1 C D

    • D. 

      1 D C

  • 40. 
    -8 is equal to signed binary number
    • A. 

      10001000

    • B. 

      11001000

    • C. 

      10000000

    • D. 

      11000000