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ECE :: Digital Electronics

  1. Which one of the following is used to change data from spatial code to temporal code?

  2. A.
    Shift register
    B.
    Counter
    C.
    A/D converters
    D.
    Combinational circuits

  3. Which of the following needs DC forward voltage to emit light?

  4. A.
    LED
    B.
    LCD
    C.
    Both LED as well as LCD
    D.
    None of the above

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

  6. A.
    1111
    B.
    1A1A
    C.
    EEEF
    D.
    FFFF

  7. In the given figure shows a 3 bit shift register using TTL flip flops. Initially all the flip flops are set to 0 state. After 8 clock pulses

  8. A.
    A = 1, B = 1, C = 1
    B.
    A = 1, B = 1, C = 0
    C.
    A = 0, B = 1, C = 1
    D.
    A = 0, B = 0, C = 1

  9. Recommended fanout for ECL is

  10. A.
    5
    B.
    10
    C.
    15
    D.
    25

  11. Race condition occurs in

  12. A.
    synchronous circuit
    B.
    asynchronous circuit
    C.
    combinational circuit
    D.
    all the Digital circuit

  13. What does the B register contain after the first MOV B, A has been executed?

  14. A.
    40 H
    B.
    60 H
    C.
    80 H
    D.
    80 D

  15. Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

  16. A.
    TTL
    B.
    CMOS
    C.
    ECL
    D.
    TTLLS

  17. Which of the following is a self-complementing code?

  18. A.
    8421 code
    B.
    Excess 3 codes
    C.
    Pure binary code
    D.
    Gray code

  19. ALU processes

  20. A.
    decimal numbers
    B.
    binary numbers
    C.
    hexadecimal numbers
    D.
    all of the above