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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

  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

  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

  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

  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

  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

  13. Precisely 1 K byte means

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

  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

  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

  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