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ECE :: Digital Electronics

  1. Assertion (A): It is possible that a digital circuit gives the same output for different input voltages

    Reason (R): A digital circuit is also called logic circuit.

  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

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  3. In a ring counter for N clock pulses the scale for the counter is

  4. A.
    N : 1
    B.
    N : 2
    C.
    N : 10
    D.
    N : 100

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  5. Assuming accumulator contain A 64 and the carry is set (1). What will register A and (CY) contain after XRA A?

  6. A.
    A 6 H, 1
    B.
    A 6 H, 0
    C.
    00 H, 0
    D.
    00 H, 1

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  7. 2's complement of (-24) =

  8. A.
    11101000
    B.
    01001000
    C.
    01111111
    D.
    00111111

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  9. Some of MOS families are PMOS, NMOS, CMOS. The family dominating the LSI field where low power consumption is necessary is

  10. A.
    NMOS
    B.
    CMOS
    C.
    PMOS
    D.
    both NMOS and CMOS

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  11. The ASCII code is

  12. A.
    5-bit code
    B.
    7-bit code
    C.
    9-bit code
    D.
    11-bit code

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  13. The binary addition 1 + 1 =

  14. A.
    11
    B.
    10
    C.
    111
    D.
    100

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  15. The Boolean function A + BC is a reduced form of

  16. A.
    AB + BC
    B.
    (A + B) . (A + C)
    C.
    AB + ABC
    D.
    (A + C) . B

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  17. Which of the following statements is not true in regard to storage time of a transistor?

  18. A.
    The transistor is in active region
    B.
    Both junctions are forward-biased
    C.
    The collector injects electrons or holes into the base region
    D.
    It is the time taken by the carriers to leave the base region

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