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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 inputs to logic gate are 0. The output is 1. The gate is

    2. A.
    NAND or XOR
    B.
    OR or XOR
    C.
    AND or XOR
    D.
    NOR or Ex-NOR

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  2. In a JK master slave flip flop race condition does not occur.

    3. A.
    True
    B.
    False

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  3. State transition table and state transition diagram form part of design steps for

    4. A.
    combinational circuits
    B.
    sequential circuits
    C.
    delay circuits
    D.
    all of the above

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  4. Which binary subtraction is incorrect?

    5. A.
    100101 - 100011 = 000000
    B.
    10000000 - 01000000 = 1000000
    C.
    10111110.1 - 101011.11 = 110010.11
    D.
    11111111 - 1111111 = 10000000

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  5. Consider the following statements:

    1. Race around condition can occur in JK flip flop when both inputs are 1
    2. A flip flop is used to store one bit of information
    3. A transparent latch is a D type flip flop
    4. Master slave flip flop is used to store two bits of information
    Which of the above are correct?

    6. A.
    1, 2, 3
    B.
    1, 3, 4
    C.
    1, 2, 4
    D.
    2, 3, 4

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  6. D FF can be used as a

    7. A.
    differentiator
    B.
    divider circuit
    C.
    delay switch
    D.
    none

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  7. In flip flops the duration of clock pulse is about

    8. A.
    3 ns
    B.
    10 ns
    C.
    25 ns
    D.
    50 ns

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  8. Which of the following is decimal equivalent of the binary 1111111?

    9. A.
    27
    B.
    87
    C.
    127
    D.
    167

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  9. A 555 timer can be used as

    10. A.
    an astable multivibrator
    B.
    monostable multivibrator
    C.
    frequency Divider only
    D.
    any of the above

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  10. Which of the following statements defines a full adder?

    11. A.
    It adds two binary digits and produces their SUM and CARRY
    B.
    It adds three inputs (two binary digits and a carry) and produces their SUM and CARRY
    C.
    It has two inputs and two outputs
    D.
    None of the above

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