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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. A short circuited stub is preferred to an open circuited stub because an open circuited stub

    2. A.
    is more difficult to fabricate and construct
    B.
    is made of transmission line of different Z0
    C.
    is liable to radiate
    D.
    is incapable of giving full range of reactance

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  2. If the peak transmitted power in a radar is increased by a factor 81, the maximum range is increased by a factor of

    3. A.
    3
    B.
    9
    C.
    27
    D.
    81

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  3. Radar is essentially an echo ranging system

    4. A.
    True
    B.
    False

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  4. In Gunn diode electrons are transferred from

    5. A.
    Ridge guide is essentially a form of capacitively loaded guide
    B.
    low to high mobility energy bands
    C.
    valley to domain formation
    D.
    domain to valley formation

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  5. Consider the following statements about radar Beacon

    1. It is also called transponder.
    2. It includes pulse transmitter, receiver and antenna.
    3. It replies with full power even when the signal receives is weak.
    Which of the above statements are correct?

    6. A.
    All
    B.
    1 and 2 only
    C.
    2 and 3 only
    D.
    2 only

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  6. Consider the following statements about instrument landing system of aircraft

    1. It ensures correct landing under conditions of low visibility.
    2. It consists of runaway localizer, glide path equipment and marker beacons.
    3. It is basically a blind landing system.
    Which of above statements are correct?

    7. A.
    All
    B.
    1 and 2 only
    C.
    1 and 3 only
    D.
    2 only

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  7. Effect of loading of line is

    8. A.
    increase in Z0, a and β
    B.
    increase in Z0 and β but decrease in a
    C.
    decrease in Z0, a and β
    D.
    decrease in Z0 and β but increase in a

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  8. Which mode has the minimum cutoff frequency in rectangular wave guides?

    9. A.
    TE11
    B.
    TE10
    C.
    TE01
    D.
    TE20

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  9. As compared to dimensions of most feeds, the skin depth at microwave frequencies is

    10. A.
    of the same magnitude
    B.
    much larger
    C.
    much smaller
    D.
    either (b) or (c)

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  10. In microwave communication links the fading due to rain occurs. The methods to solve this problem include

    11. A.
    antenna replacement and feed correction
    B.
    amplitude trimming and phase correction
    C.
    polarization shifting and code diversity
    D.
    path diversity and frequency diversity

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