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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. Which mode is called dominant mode in rectangular wave guide?

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

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  2. In a TWT the loss in attenuator is

    3. A.
    almost equal to forward gain of tube
    B.
    much less than forward gain of tube
    C.
    much higher than forward gain of tube
    D.
    almost infinite

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  3. To study electromagnetic radiations from astronomical objects, radio astronomers use

    4. A.
    low frequencies
    B.
    medium frequencies
    C.
    microwaves
    D.
    either (a) or (b)

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  4. Radar reciever has high sensitivity and low noise figure

    5. A.
    True
    B.
    False

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  5. For a waveguide, which of the following statements is wrong?

    6. A.
    It is usually made of brass or aluminium
    B.
    It is usually rectangular or circular in shape
    C.
    The dielectric region is usually air
    D.
    The wall thickness is very small as compared to skin depth

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  6. A transmission line discontinuity is defined as any interruption in the uniformity of the line.

    7. A.
    True
    B.
    False

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  7. Interference generated by electrical equipment and automobile ignition systems when observed closed to earth is

    8. A.
    horizontally polarized
    B.
    vertically polarized
    C.
    polarized both horizontally
    D.
    not polarized

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  8. The earliest uses of electromagnetic waves were

    9. A.
    point to point communication
    B.
    radar
    C.
    both (a) and (b)
    D.
    neither (a) nor (b)

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  9. At millimeter wavelength the favoured mode in circular wave guide is

    10. A.
    TE01
    B.
    TE11
    C.
    TE20
    D.
    TE21

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  10. In laboratory experiment the output from reflex klystron is moderated by square wave because

    11. A.
    it is easy to generate a square wave
    B.
    crystal diode operates in square law region of i-v characteristics
    C.
    it prevents frequency modulation
    D.
    detector circuit is less complicated

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