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ECE :: Digital Electronics

  1. The product of which of the following gives the figure of merit of a logic family?

  2. A.
    Gain and bandwidth
    B.
    Propagation delay time and power dissipation
    C.
    Fan-out and propagation delay time
    D.
    Noise margin and power dissipation

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  3. A JK flip flop can be converted to D flip flop by

  4. A.
    Connecting both J and K terminals to D
    B.
    Connecting J terminal to D and leaving K open
    C.
    Connecting K terminal to D and leaving J open
    D.
    Connecting J terminal to D and K terminal to D through an inverter

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  5. In a 4 bit parallel in parallel out shift register A = 1, B = 1, C = 0, D = 1. The data output after 3 clock pulses is

  6. A.
    1101
    B.
    1001
    C.
    0101
    D.
    0001

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  7. Assertion (A): A 4 input variable logic circuit can be implemented using a 8 : 1 multiplexer.

    Reason (R): When a multiplexer is used as a logic function generator, the logic design is simple.

  8. 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

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  9. A 6 MHz channel is used by a digital signalling system initializing four-level signals. The maximum possible transmission rate is

  10. A.
    6M bands/s
    B.
    12M bands/s
    C.
    6 M bits/s
    D.
    12M bits/s

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  11. Data can be changed from spatial code to temporal code and vice-versa by using

  12. A.
    ADC and DAC
    B.
    shift Register
    C.
    synchronous counter
    D.
    timers

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  13. Precisely 1 K byte means

  14. A.
    1000 bits
    B.
    1012 bits
    C.
    1020bits
    D.
    1024 bits

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  15. In 8156, the lower times byte is addressed with 24 H, and the upper times byte with

  16. A.
    20 H
    B.
    23 H
    C.
    24 H
    D.
    25 H

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  17. In the CMOS inverter

  18. A.
    one transistor is N channel and the other P channel
    B.
    one is enhancement type and other depletion type
    C.
    both are N channel with one enhancement and the other depletion type
    D.
    none

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  19. Which of the following is incorrect?

  20. A.
    11101 + 10 = 11111
    B.
    (8)8 + (2)8 = (11)8
    C.
    (8)16 + (7)16 = E
    D.
    All of them are incorrect

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