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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. A 3 bit synchronous counter uses FF with propagation delay time of 20 ns each. The maximum possible time required for change of state will be.

    2. A.
    60 ns
    B.
    40 ns
    C.
    20 ns
    D.
    None

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  2. Computer ICs work reliably because

    3. A.
    they are based on two state design
    B.
    these are made from pure silicon
    C.
    these are maintained at two temperatures
    D.
    none of the above

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  3. Octal 16 is equal to decimal

    4. A.
    13
    B.
    14
    C.
    15
    D.
    16

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  4. The Boolean expression Y = (A + B + AB) C then Y will be equal to

    5. A.
    AC
    B.
    BC
    C.
    C
    D.
    none

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  5. In 8085 microprocessor, how many lines are there in address bus?

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

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  6. A TTL circuit with totem pole output has

    7. A.
    high output impedance
    B.
    low output impedance
    C.
    very high output impedance
    D.
    none of the above

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  7. The main drawbacks of EEPROM are

    8. A.
    low density
    B.
    high cost
    C.
    both low density and high cost
    D.
    none of the above

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  8. How many JK flip-flops are needed to make a 4-bit shift register?

    9. A.
    2
    B.
    4
    C.
    6
    D.
    8

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  9. A 10 MHz square wave clocks 5 bit ripple counter. The frequency of the 3rd FF output is

    10. A.
    2 MHz
    B.
    1.25 MHz
    C.
    50 MHz
    D.
    615 kHz

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  10. The radix of a hexadecimal system is

    11. A.
    2
    B.
    3
    C.
    8
    D.
    16

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