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ECE :: Digital Electronics

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

  2. A.
    True
    B.
    False

  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

  5. In which of these does thermionic emission occur?

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

  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

  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

  11. 39.1210 = __________ 10

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

  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

  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

  17. The op amp is used in

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

  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