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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. Which memory requires periodic recharging?

    2. A.
    All ROMS
    B.
    All RAMS
    C.
    Static RAM
    D.
    Dynamic RAM

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  2. The hexadecimal number given below represent decimal numbers which are multiples of DC, C8, BE, 46, IE

    3. A.
    2
    B.
    6
    C.
    7
    D.
    10

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  3. A master slave flip-flop has the characteristics that

    4. A.
    change in the I/P immediately reflected in the O/P
    B.
    change in the O/P occurs when the state of the master is affected
    C.
    change in the output occurs when the state of the slave is affected
    D.
    both the master and the slave states are affected at the same time

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  4. Which of the following flip-flops is used as latch?

    5. A.
    JK flip-flop
    B.
    D flip-flop
    C.
    RS flip-flop
    D.
    T flip-flop

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  5. Least expensive logic

    6. A.
    RTL
    B.
    DTL
    C.
    TTL
    D.
    ECL

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  6. The circuit show in the figure has 4 boxes each described by inputs P, Q, R and outputs y, z with
    Y = P ⊕ Q ⊕ R, Z = RQ + PR + QP The circuit act as a

    7. A.
    4 bit adder giving P + Q
    B.
    4 bit subtractor P - Q
    C.
    4 bit subtractor Q - P
    D.
    4 bit adder P + Q + R

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  7. Logic pulser

    8. A.
    generates short duration pulses
    B.
    generates long duration pulses
    C.
    generates sinusoidal voltage
    D.
    generates ideal pulses

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  8. The no. of FF required and the maximum decimal no. of a MOD-12 counter is

    9. A.
    12, 12
    B.
    4, 11
    C.
    3, 6
    D.
    4, 10

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  9. In a four variable K map eight adjacent cells give

    10. A.
    single variable term
    B.
    two variable term
    C.
    three variable term
    D.
    four variable term

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  10. The MOS symbol shown indicates that

    1. It is depletion type
    2. It is enhancement type
    3. It is channel
    4. It is P-channel
    5. Electrons flow from s to D
    6. Holes flow from D to s
    The true statements are

    11. A.
    1, 3, 6
    B.
    1, 3, 5
    C.
    2, 4, 6
    D.
    2, 3, 5

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