Home / ECE / Digital Electronics :: Section 12

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

  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

  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

  7. Digital circuits mostly use

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

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

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

  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

  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

  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

  17. 2's complement number 00011111 = __________ 10

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

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

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