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ECE :: Digital Electronics

  1. What is the direction of control bus?

  2. A.
    Unidirection into μp
    B.
    Unidirection out of up
    C.
    Bidirectional
    D.
    Mixed direction i.e., some lines into μp and some other out of μp

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  3. In the given figure assume that initially Q = 1 with Clock Pulses being given, the subsequent states of Q will be

  4. A.
    1, 0, 1, 0, 1......
    B.
    0, 0, 0, 0, 0......
    C.
    1, 1, 1, 1, 1......
    D.
    0, 1, 0, 1, 0......

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  5. The Boolean expression (A + B) (A + C) (B + C) simplifies to

  6. A.
    (A + B) C
    B.
    (A + B) C
    C.
    (A + B) C
    D.
    none of these

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  7. If Vin is 0.99 V, what is the digital output of the ADC 0801 after INTER goes low?

  8. A.
    0011 0011
    B.
    0101 1111
    C.
    0111 1100
    D.
    1111 1111

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  9. Which of the following operation are performed on linear queues?

    1. Testing a linear queue for underflow
    2. Enqueue operation
    3. Dequeue operation
    4. Testing a linear queue for overflow.
    Select the correct answer using the codes given below the lists

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

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  11. As access time is decreased, the cost of memory

  12. A.
    remains the same
    B.
    increases
    C.
    decreases
    D.
    may increase or decrease

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  13. Assertion (A): Hamming code is commonly used for error correction

    Reason (R): In Hamming code the number of parity bits increases as the number of information bits increases.

  14. 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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  15. A 2 bit binary multiplier can be implemented using

  16. A.
    2 inputs ANDs only
    B.
    2 I/P XOR and 4 I/P AND gate only
    C.
    two 2 inputs NORs and One XNOR gate
    D.
    XOR gates and shift registers

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  17. A microcomputer has memory locations from 0000 to FFFF, each storing 1 byte. How many bytes can be the memory store?

  18. A.
    12333
    B.
    14666
    C.
    16384
    D.
    16655

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  19. Typical size of digital IC is about

  20. A.
    1″ x 1″
    B.
    2″ x 2″
    C.
    0.1″ x 0.1″
    D.
    0.001″ x 0.001″

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