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ECE :: Exam Questions Paper

  1. Which of the following counters can be used to divide the clock frequency of a microprocessor by 5?

  2. A.
    3 bit counter
    B.
    5 bit counter
    C.
    mod 3 counter
    D.
    mod 5 counter

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  3. In the given circuit, the switch has been in position 1 for quite a long time. At t = 0 the switch is moved to position 2. At this position what is the time constant?

  4. A.
    0.1 s
    B.
    1 s
    C.
    0.11 s
    D.
    1.11 s

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  5. A divide by 78 counters can be realized by using

  6. A.
    six mod-13 counters
    B.
    thirteen mod-6 counters
    C.
    one mod 13 counter followed by one mod-6 counter
    D.
    thirteen mod-13 counters

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  7. The process of extension of a single-crystal surface by growing a film in such a way that the added atoms form a continuation of the single-crystal structure is called

  8. A.
    Ion implantation
    B.
    Chemical vapour deposition
    C.
    Electroplating
    D.
    Epitaxy

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  9. Which of the following are the non-linear application of op-amp?

    1. Current-to-voltage converter
    2. Comparator
    3. Peak detector
    4. Limiter
    Select the correct answer from the codes given below:

  10. A.
    1, 2 and 3
    B.
    2, 3 and 4
    C.
    1, 3 and 4
    D.
    1, 2 and 4

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  11. Which of the following does not cause losses in optical fibre cables?

  12. A.
    Impurities
    B.
    Microbending
    C.
    Attenuation in glass
    D.
    Stepped index operation

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  13. Which of the following introduces mode partition noise?

  14. A.
    Coaxial line
    B.
    Waveguide
    C.
    Fibre transmission line
    D.
    Both coaxial line and waveguide

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  15. Foster Seeley discriminator uses a

  16. A.
    double tuned circuit in which primary and secondary are tuned to different frequencies
    B.
    double tuned circuit in which primary and secondary are tuned to same frequencies
    C.
    single tuned circuit
    D.
    three triodes in series

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  17. Consider the differential amplifier shown in figure. (Assume β is very high).

    Zin (base) =

  18. A.
    1 MΩ
    B.
    100 kΩ
    C.
    15 kΩ
    D.
    ≈ 0

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  19. Assertion (A): The line integral of B about a closed contour, in a region containing steady current, is μ0 times the total net current, following through the contour of integration.

    Reason (R): The curl of B is equal to μ0 times the current density vector J

  20. A.
    Both (A) and (R) are true and (R) is the correct explanation of (A)
    B.
    Both (A) and (R) are true but (R) is not the correct explanation of (A)
    C.
    (A) is true but (R) is false
    D.
    (A) is false but (R) is true

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