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ECE :: Digital Electronics

  1. Assertion (A): In a parallel in-serial out shift register data is loaded one bit-at a time

    Reason (R): A serial in-serial out shift register can be used to introduce a time delay.

  2. 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

  3. In an 8085 microprocessor, the instruction CMP B has been executed while the content of the accumulator is less than that of register B, As a result.

  4. A.
    carry flag will be set but zero flag will be reset
    B.
    carry flag will be reset but zero flag will be set
    C.
    both carry flag and zero flag will be reset
    D.
    both carry flag and zero flag will be set

  5. Computers use thousands of flip-flops. To coordinate the overall action, a common signal is sent to all flip-flop known as

  6. A.
    debug signal
    B.
    toggle signal
    C.
    active signal
    D.
    clock signal

  7. Which has the highest power dissipation per gate?

  8. A.
    ECL
    B.
    TTL
    C.
    CMOS
    D.
    PMOS

  9. A Schottky diode has

  10. A.
    no minority carriers and very low voltage drop in forward direction
    B.
    no minority carriers and very high voltage drop in forward direction
    C.
    large number of minority carriers and very high voltage drop in forward direction
    D.
    large number of minority carriers and very low voltage drop in forward direction

  11. (FE35)16 XOR (CB15)16 is equal to

  12. A.
    (3320)16
    B.
    (FE35)16
    C.
    (FF50)16
    D.
    (3520)l6

  13. Boolean algebra obeys

  14. A.
    commutative law
    B.
    associative law
    C.
    distributive law
    D.
    commutative, associative and distributive law

  15. The figure of merit for a logic family is

  16. A.
    gain band width product
    B.
    (propagation delay time) (power dissipation)
    C.
    (fan out) (power dissipation)
    D.
    (noise margin) (power dissipation)

  17. A universal register

  18. A.
    accepts serial input
    B.
    accepts Parallel input
    C.
    gives serial and Parallel output
    D.
    all of the above

  19. (1001-10) is equal to

  20. A.
    7
    B.
    (8)8
    C.
    (7)4
    D.
    (8)4