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CuriousTab

Digital Electronics problems


  • 1. 2's complement of binary number 0101 is

  • Options
  • A. 1011
  • B. 1111
  • C. 1101
  • D. 1110
  • Discuss
  • 2. In a ripple counter,

  • Options
  • A. whenever a flip flop sets to 1, the next higher FF toggles
  • B. whenever a flip flop sets to 0, the next higher FF remains unchanged
  • C. whenever a flip flop sets to 1, the next higher FF faces race condition
  • D. whenever a flip flop sets to 0, the next higher FF faces race condition
  • Discuss
  • 3. Which device has one input and many outputs?

  • Options
  • A. Multiplexer
  • B. Demultiplexer
  • C. Counter
  • D. Flip flop
  • Discuss
  • 4. The greatest negative number which can be stored is 8 bit computer using 2's complement arithmetic is

  • Options
  • A. - 256
  • B. - 128
  • C. - 255
  • D. - 127
  • Discuss
  • 5. For the minterm designation Y = ? m (1, 3, 5, 7) the complete expression is

  • Options
  • A. Y = A BC + A B C
  • B. Y = A B C + A B C + ABC + A BC
  • C. Y = A B C + A B C + ABC + A BC
  • D. Y = A B C + ABC + A BC + A BC
  • Discuss
  • 6. A ring counter with 5 flip flops will have

  • Options
  • A. 5 states
  • B. 10 states
  • C. 32 states
  • D. infinite states
  • Discuss
  • 7. The resolution of an n bit DAC with a maximum input of 5 V is 5 mV. The value of n is

  • Options
  • A. 8
  • B. 9
  • C. 10
  • D. 11
  • Discuss
  • 8. An AND gate has two inputs A and B and one inhibit input 3, Output is 1 if

  • Options
  • A. A = 1, B = 1, S = 1
  • B. A = 1, B = 1, S = 0
  • C. A = 1, B = 0, S = 1
  • D. A = 1, B = 0, S = 0
  • Discuss
  • 9. The fixed count that should be used so that the output register will represent the input for a 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000).

  • Options
  • A. 000110
  • B. 0010
  • C. 1111
  • D. 011101
  • Discuss
  • 10. The output of a half adder is

  • Options
  • A. SUM
  • B. CARRY
  • C. SUM and CARRY
  • D. none of the above
  • Discuss

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