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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. Consider the following statements: A multiplier

    1. selects one of the several inputs and steers it to the output
    2. routes the data from a single input to many outputs
    3. converts parallel data into serial data
    4. is a combinational circuit
    On the above statements which are correct?

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

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  2. In the full adder, denoting Sum by S and carry by C

    3. A.
    S = 1 when two or more inputs are unity
    B.
    C = 1 when two or more inputs are unity
    C.
    C = 1 when all the inputs are unity
    D.
    S = 1 when all the inputs are unity

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  3. Each term in POS form is called max terms.

    4. A.
    True
    B.
    False

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  4. When signed numbers are used in binary arithmetic, which of the following has unique representation for zero?

    5. A.
    Sign-magnitude
    B.
    1's complement
    C.
    2's complement
    D.
    9's complement

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  5. Which of the following characteristics is not true for TTL Logic?

    6. A.
    Good speed
    B.
    Low power dissipation per gate
    C.
    High cost
    D.
    None of these

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  6. In 8085 microprocessor, an interrupt service request is serviced

    7. A.
    immediately on receipt of request
    B.
    after the execution of the current instruction is completed
    C.
    at the end of the current machine cycle
    D.
    none

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  7. Which interrupts are masked?

    8. A.
    5.5
    B.
    6.5
    C.
    7.5
    D.
    None

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  8. A clock pulse is fed into 3 bit binary down count. The signal at B output is

    9. A.
    B.
    C.
    D.
    none of these

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  9. Assertion (A): A high density IC has more diodes, transistors and resistors per unit surface area.

    Reason (R): A high density IC can handle high voltages.

    10. 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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  10. CMOS is extensively used in

    11. A.
    pocket calculators
    B.
    digital wrist watches
    C.
    satellites
    D.
    all of the above

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