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ECE :: Digital Electronics

  1. A clock signal coordinates the working of different flip flops.

  2. A.
    True
    B.
    False

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  3. In 8085, usually the vector location and the next two memory location contain a JMP instruction. This allows the programs to branch to

  4. A.
    a longer subroutine
    B.
    a shorter subroutine
    C.
    a subroutine free path
    D.
    none of the above

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  5. In which of these does thermionic emission occur?

  6. A.
    LED
    B.
    LCD
    C.
    VF display
    D.
    None

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  7. In a positive-edge-triggered JK flip-flop, a low J and a low K produce __________ state. A high __________ on the rising edge of the clock.

  8. A.
    inactive, reset
    B.
    active, reset
    C.
    active, toggle
    D.
    inactive, toggle

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  9. The rate of change of digital signals between High and Low level is

  10. A.
    very fast
    B.
    fast
    C.
    slow
    D.
    very slow

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  11. 39.1210 = __________ 10

  12. A.
    10111.0001111
    B.
    100011.0001111
    C.
    100001.0001111
    D.
    001111.0001111

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  13. Which of the following is best suited for parity checking and parity generation?

  14. A.
    AND, OR, NOT gates
    B.
    XOR, Exclusive NOR gate
    C.
    NAND gates
    D.
    NOR gates

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  15. In the circuit shown below, the outputs Y1 and Y2 for the given initial condition Y1 = Y2 = 1 and after four input pulses will be

  16. A.
    Y1 = 1, Y2 = 0
    B.
    Y1 = 0, Y2 = 0
    C.
    Y1 = 0, Y2 = 1
    D.
    Y1 = 1, Y2 = 1

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  17. The op amp is used in

  18. A.
    A/D converters
    B.
    D/A converters
    C.
    both (a) and (b)
    D.
    shift registers

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  19. Assertion (A): Power drain of CMOS increases with operating frequency

    Reason (R): All unused CMOS inputs should be tied either to a fixed voltage level (0 or VDD) or to another input.

  20. 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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