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ECE :: Digital Electronics

Digital Electronics - Section 1
Digital Electronics - Section 2
Digital Electronics - Section 3
Digital Electronics - Section 4
Digital Electronics - Section 5
Digital Electronics - Section 6
Digital Electronics - Section 7
Digital Electronics - Section 8
Digital Electronics - Section 9
Digital Electronics - Section 10
Digital Electronics - Section 11
Digital Electronics - Section 12
Digital Electronics - Section 13
Digital Electronics - Section 14
Digital Electronics - Section 15
Digital Electronics - Section 16
Digital Electronics - Section 17
Digital Electronics - Section 18
Digital Electronics - Section 19
Digital Electronics - Section 20
Digital Electronics - Section 21
Digital Electronics - Section 22
Digital Electronics - Section 23
Digital Electronics - Section 24
Digital Electronics - section-25
Digital Electronics - Section-26

  1. The digit F in hexadecimal system is equivalent to number __________ in decimal system.

    2. A.
    16
    B.
    15
    C.
    17
    D.
    8

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  2. In level clocking the output can change

    3. A.
    on rising edge of clock cycle
    B.
    on falling edge of clock cycle
    C.
    during entire half cycle of the clock
    D.
    none of the above

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  3. Which family of logic circuits uses field effect transistors?

    4. A.
    TTL
    B.
    CMOS
    C.
    Both LED and well as LCD
    D.
    None of the above

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  4. An encoder converts decimal numbers to binary and other codes.

    5. A.
    True
    B.
    False

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  5. Examine the following truth table. The product of sum from this truth table is

    6. A.
    (X + Y) (X + Y)
    B.
    (X + Y) (X + Y)
    C.
    (X + Y) (X + Y)
    D.
    (X + Y) (X + Y)

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  6. K maps can be drawn

    7. A.
    only for 2 variables
    B.
    only for 3 variables
    C.
    only for 4 variables
    D.
    for any number of variables

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  7. When a TTL is driving an CMOS gates it is necessary to ensure that

    8. A.
    VOL(for TTL) ≤ VIL (for CMOS) and V0H (for TTL) ≥ VIH (for CMOS)
    B.
    V0L (for TTL) ≥ VIL (for CMOS)
    C.
    V0H (for TTL) ≤ VIH (for CMOS)
    D.
    V0L (for TTL) ≥ VIL (for CMOS) and V0H (for TTL) ≤ VIH (for CMOS)

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  8. Which of the following statement is correct?

    9. A.
    Decimal 9 is represented as 1011 in Excess-3 code
    B.
    Decimal 9 is represented as 1001 is BCD code
    C.
    Decimal 10 is represented as 1100 is Gray code
    D.
    Decimal 10 is represented as 1001 in binary code

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  9. For emitter-couple logic, the switching speed is very high because

    10. A.
    negative logic is used
    B.
    the transistors are not saturated when conducting
    C.
    emitter-coupled transistors are used
    D.
    multi-emitter transistors are used

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  10. Subroutines are used in larger programs not

    11. A.
    to increase the programming case
    B.
    to reduce storage equipment
    C.
    to reduce program extension time
    D.
    for ease of program testing at the program development time

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