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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

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  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

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  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

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  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

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  9. Recommended fanout for ECL is

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

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  11. Race condition occurs in

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

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  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

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  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

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  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

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  19. ALU processes

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

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