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Digital Electronics problems

  • 1. A device which converts BCD to seven segment is called

  • Options
  • A. encoder
  • B. decoder
  • C. multiplexer
  • D. none of these
    • Discuss
  • 2. A 12 bit ADC is used to convert analog voltage of 0 to 10 V into digital. The resolution is

  • Options
  • A. 2.44 mV
  • B. 24.4 mV
  • C. 1.2 V
  • D. none of the above
    • Discuss
  • 3. In a 7 segment display, LEDs b and c lit up. The decimal number displayed is

  • Options
  • A. 9
  • B. 7
  • C. 3
  • D. 1
    • Discuss
  • 4. BCD input 1000 is fed to a 7 segment display through a BCD to 7 segment decoder/driver. The segments which will lit up are

  • Options
  • A. a, b, d
  • B. a, b, c
  • C. all
  • D. a, b, g, c, d
    • Discuss
  • 5. 7BF16 = __________ 2

  • Options
  • A. 0111 1011 1110
  • B. 0111 1011 1111
  • C. 0111 1011 0111
  • D. 0111 1011 0011
    • Discuss
  • 6. The circuit in the given figure is
    Electronics and Communication Engineering Digital Electronics: The circuit in the given figure is

  • Options
  • A. positive logic OR gate
  • B. negative logic OR gate
  • C. negative logic AND gate
  • D. positive logic AND gate
    • Discuss
  • 7. In a BCD to 7 segment decoder the minimum and maximum number of outputs active at any time is

  • Options
  • A. 2 and 7
  • B. 3 and 7
  • C. 1 and 6
  • D. 3 and 6
    • Discuss
  • 8. For the gate in the given figure the output will be
    Electronics and Communication Engineering Digital Electronics: For the gate in the given figure the output will be

  • Options
  • A. 0 
  • B. 1
  • C. A
  • D. A
    • Discuss
  • 9. AB + AB =

  • Options
  • A. B
  • B. A
  • C. 1
  • D. 0
    • Discuss
  • 10. A three state switch has three outputs. These are

  • Options
  • A. low, low and high
  • B. low, high, high
  • C. low. floating, low
  • D. low, high, floating
    • Discuss

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