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ECE :: Digital Electronics

  1. In a shift register the data is loaded in one operation but shifted out one bit at a time, The shift register is

  2. A.
    serial in-serial out
    B.
    parallel in-serial out
    C.
    serial in-parallel out
    D.
    parallel in-parallel out

  3. In CCD

  4. A.
    a small charge is deposited for logical 1
    B.
    a small charge is deposited for both logical 1 and 0
    C.
    a small charge is deposited for logical 0 and large charge for logical 1
    D.
    none of the above

  5. The contents of the program counter after the call operation point to the first instruction on the

  6. A.
    stack
    B.
    subroutine
    C.
    either of the above
    D.
    none of the above

  7. Dual slope ADC uses an op amp comparator.

  8. A.
    True
    B.
    False

  9. The output of the 74 series of TTL gates is taken from a BST in

  10. A.
    totem pole and common collector configuration
    B.
    either totem pole or open collector configuration
    C.
    common base configuration
    D.
    common collector configuration

  11. Assertion (A): Demorgan's first theorem replaces a NOR gate by bubbled AND gate.

    Reason (R): Double complement of a variable equals the variable.

  12. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is true, R is false
    D.
    A is false, R is true

  13. A flip-flop circuit is

  14. A.
    monostable
    B.
    bistable
    C.
    multistable
    D.
    unstable

  15. Assertion (A): The use of 2's complement has simplified the computer hardware for arithmetic operations

    Reason (R): 2's complement is obtained by adding 1 to 1's complement.

  16. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is true, R is false
    D.
    A is false, R is true

  17. How many lines are there in address bus of 8085 μp?

  18. A.
    6
    B.
    8
    C.
    12
    D.
    16

  19. Consider the following statements Timer 555 can be used as

    1. monostable multivibrator
    2. bistable multivibrator
    3. astable multivibrator
    Which of the above statements are correct?

  20. A.
    1 and 2
    B.
    1 and 3
    C.
    2 and 3
    D.
    1, 2, 3