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ECE :: Digital Electronics

  1. DeMorgan's second theorem is

  2. A.
    A . A = 0
    B.
    A = A
    C.
    A + B = A . B
    D.
    AB = A + B

  3. In a D latch

  4. A.
    a high D sets the latch and low D resets it
    B.
    a low D sets the latch and high D resets it
    C.
    race can occur
    D.
    none of the above

  5. In floating point representation, mantissa is expressed in

  6. A.
    excess 3 notation
    B.
    gray code
    C.
    excess 32 notation
    D.
    2's complement

  7. Which of the circuits in the given figure that converts JK flip flop to T flip flop?


  8. In the generic microprocessor

  9. A.
    instruction cycle time period is shorter than machine cycle time period
    B.
    machine cycle time period is shorter than instruction cycle time period
    C.
    instruction cycle time period is exactly half of machine cycle time period
    D.
    instruction cycle time period is exactly equal to machine cycle time period

  10. Consider the following registers:

    1. A accumulator and B register
    2. B and C registers
    3. D and E registers
    4. H and L registers
    Which of these 8-bit registers of 8085 μP can be paired together to make a 16-bit register?

  11. A.
    1, 3 and 4
    B.
    2, 3 and 4
    C.
    1 and 2
    D.
    1, 2 and 3

  12. Access time of a storage is the time required

  13. A.
    to write one word into the memory
    B.
    to read one word from the memory
    C.
    to write one word into and to read one word from the memory
    D.
    either to write one word or to read one word

  14. For a D/A converter, inputs and outputs are given. The output corresponding to digital input 01000

  15. A.
    2.0 V
    B.
    2.5 V
    C.
    3.0 V
    D.
    4.0 V

  16. By placing an inverter between both inputs of an S-R flip-flop, the resulting flip-flop becomes

  17. A.
    J-K flip-flop
    B.
    D-flip-flop
    C.
    T-flip-flop
    D.
    Master salve JK flip-flop

  18. Which of the following flip-flop do not have race problem?

  19. A.
    T flip-flop
    B.
    D flip-flop
    C.
    JK flip-flop
    D.
    Master-slave flip-flop