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ECE :: Microwave Communication

Microwave Communication - Section 1
Microwave Communication - Section 2
Microwave Communication - Section 3
Microwave Communication - Section 4
Microwave Communication - Section 5
Microwave Communication - Section 6
Microwave Communication - Section 7
Microwave Communication - Section 8

  1. The directivity in a receiving antenna

    1. increases the intercept area in forward direction
    2. reduces the noise picked up from other sources
    3. provides a means of discriminating against undesired signals originating in directions other than in which the desired transmitter lies.
    Which of the above statements are correct?

    2. A.
    1 only
    B.
    1 and 2 only
    C.
    1, 2 and 3
    D.
    2 and 3 only

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  2. Assertion (A): PIN diode can be used as attenuator and limiter.

    Reason (R): PIN diode has a thin intrinsic layer.

    3. 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 correct but R is wrong
    D.
    A is wrong but R is correct

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  3. The bunching action which occurs in multicavity klystron amplifier can be represented by Applegate diagram

    4. A.
    True
    B.
    False

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  4. The cut off wavelength in circular waveguide

    5. A.
    guide diameter
    B.
    square of guide diameter
    C.
    cube of guide diameter
    D.
    square root of guide diameter

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  5. In Reflex Klystron oscillator the focussing electrode is at a high potential

    6. A.
    True
    B.
    False

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  6. Consider the following statements

    1. Impedance of Gunn diode is about tens of ohms.
    2. Impedance of Impatt diode is a few ohms.
    3. Impedance of Impatt diode are of the same order.
    4. Impedance of Impatt diode is more than that of Gunn diode.
    Which of the above statement are correct?

    7. A.
    all
    B.
    1 and 2 only
    C.
    1, 2 and 3
    D.
    1, 2 and 4

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  7. In high frequency circuits impedance matching can be done by

    1. open circuited stubs
    2. short circuited stubs
    3. transformer
    Which of the above correct?

    8. A.
    1, 2 and 3
    B.
    1 and 2 only
    C.
    1 and 3 only
    D.
    2 and 3 only

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  8. The directive gain of a transmitting antenna is proportional to

    9. A.
    its cross-sectional area
    B.
    square of cross-sectional area
    C.
    square root of cross-sectional area
    D.
    cube root of cross-sectional area

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  9. In a loss line RL < Z0, then

    10. A.
    Reflection coefficient is zero
    B.
    Reflection coefficient is ∞
    C.
    Reflection coefficient is negative
    D.
    Reflection coefficient is positive

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  10. Assertion (A): A backward wave oscillator can be used as a sweep generator.

    Reason (R): The frequency of oscillation of a backward wave oscillator can be changed by varying the voltage which controls the beam velocity.

    11. 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 correct but R is wrong
    D.
    A is wrong but R is correct

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