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ECE :: Digital Electronics

  1. The circuit shown in figure converts

  2. A.
    BCD to binary code
    B.
    binary to excess-3 code
    C.
    excess-3 to Gray code
    D.
    gray to binary code

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  3. The microprograms provided by a manufacturer to be used on his microprogrammed computer are generally called

  4. A.
    software
    B.
    network
    C.
    firmware
    D.
    hardware

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  5. Out of multiplexer and demultiplexer, which has select inputs?

  6. A.
    Multiplexer only
    B.
    Demultiplexer only
    C.
    Both multiplexer and demultiplexer
    D.
    None

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  7. What is the direction of address bus?

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

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  9. Direct-memory-access channel facilitates data to move into and out of the system.

  10. A.
    without subroutine
    B.
    with equal time delay
    C.
    without programme intervention
    D.
    on first come first serve basis

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  11. The basic circuit configuration for TTL resembles that of a

  12. A.
    AND gate
    B.
    NAND gate
    C.
    NOR gate
    D.
    OR gate

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  13. Time delay of a TTL standard family is about

  14. A.
    180 ns
    B.
    50 ns
    C.
    18 ns
    D.
    3 ns

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  15. Assertion (A): Boolean expressions can be easily simplified using Karnaugh map.

    Reason (R): Karnaugh map can be drawn for minterms as well as max terms.

  16. 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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  17. In a flip flop which input determines the state to which output will transistion?

  18. A.
    Control input
    B.
    Clock input
    C.
    Both control and clock input
    D.
    Either control or clock input

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  19. In a synchronous counter all flip flops are clocked together.

  20. A.
    True
    B.
    False

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