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ECE :: Digital Electronics

  1. What is the gray code word for EX-OR the binary number 101011?

  2. A.
    101011
    B.
    110101
    C.
    111110
    D.
    011111

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  3. In a positive edge triggered JK flip flop, J = 1, K = 0 and clock pulse is rising Q will

  4. A.
    be 0
    B.
    be 1
    C.
    show no change
    D.
    toggle

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  5. A 16 bit binary adder has

  6. A.
    16 half adders
    B.
    16 full adders
    C.
    one half adders and 15 full adders
    D.
    8 half adders and eight full adders

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  7. Digital circuits mostly use

  8. A.
    Diodes
    B.
    Bipolar transistors
    C.
    Diodes and bipolar transistors
    D.
    Bipolar transistors and FETs

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  9. The contents of stack location after the call operation will be

  10. A.
    00000111
    B.
    00001110
    C.
    00001010
    D.
    00001111

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  11. In figure, R = 20KΩ and C = 75 pF. The converter clock frequency will be

  12. A.
    606 Hz
    B.
    1212 Hz
    C.
    555 KHz
    D.
    606 KHz

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  13. If a microcomputer has a 64 K memory; what is the hexadecimal notations for the first memory location?

  14. A.
    AAAA
    B.
    FFFF
    C.
    AAA0
    D.
    0000

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  15. In the switching circuit, switches A, B have value 0 for OFF, 1 for ON and the output Y has 0 volts for 1 volts, then the expression for Y is

  16. A.
    AB
    B.
    A + B
    C.
    A + B
    D.
    AB

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  17. 2's complement number 00011111 = __________ 10

  18. A.
    +31
    B.
    -31
    C.
    +11
    D.
    -11

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  19. In 8085 microprocessor, what is the length of temporary register?

  20. A.
    6 bits
    B.
    8 bits
    C.
    12 bits
    D.
    16 bits

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