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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 cavity resonator is

    2. A.
    a hollow metallic enclosure
    B.
    a hollow enclosure having magnetic material as its walls
    C.
    a hollow enclosure having dielectric material as its walls
    D.
    either (b) or (c)

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  2. If antenna diameter is increased four times, the maximum range is increased by a factor of

    3. A.
    2
    B.
    2
    C.
    4
    D.
    0.2

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  3. Assertion (A): Gunn diode is a transferred electron device.

    Reason (R): A Gunn oscillator uses the phenomenon of transferred electron effect.

    4. 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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  4. Atomic and molecular resonance is observed in many substances

    5. A.
    at microwave frequencies
    B.
    at low frequencies
    C.
    at frequencies used in AM broadcast
    D.
    at both (b) and (c)

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  5. The component in the given figure is

    6. A.
    attenuator
    B.
    T type low pass filter
    C.
    T type high pass filter
    D.
    phase shifter

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  6. The semiconductor diode which can be used in switching circuit in microwave range is

    7. A.
    PIN diode
    B.
    Varactor diode
    C.
    Tunnel diode
    D.
    Gunn diode

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  7. In the given figure the reflected current wave after first reflection is

    8. A.
    0.18 A
    B.
    -0.18 A
    C.
    0.3 A
    D.
    -0.3 A

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  8. A line has an attenuation of 0.054 Np/m. The attenuation in decibels is

    9. A.
    4.7 dB/m
    B.
    0.47 dB/m
    C.
    0.54 dB/m
    D.
    5.4 dB/m

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  9. If a line is open circuited Zin = Z0 tanh (gl).

    10. A.
    True
    B.
    False

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  10. A reflex klystron oscillator uses

    11. A.
    one cavity resonator
    B.
    two cavity resonators
    C.
    three cavity resonators
    D.
    none of the above

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