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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. In a rectangular waveguide

    2. A.
    the broad width is generally labelled 'a' and height 'b'
    B.
    the broad width is generally labelled 'b' and height 'a'
    C.
    any one of the dimensions may be labelled 'a' and the other 'b'
    D.
    the length is labelled as 'a'

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  2. Which of the following modes cannot exist in rectangular resonant cavity?

    3. A.
    TE110
    B.
    TE011
    C.
    TM110
    D.
    TM111

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  3. In a Gunn diode oscillator drift velocity of electron is 107 cm/s and active region length is 10 x 10-4 cm. The natural frequency of oscillation is

    4. A.
    1 MHz
    B.
    10 MHz
    C.
    1 GHz
    D.
    10 GHz

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  4. Assertion (A): An artificial transmission line can be used as a pulse generator.

    Reason (R): A pulse function is used very frequently in network analysis.

    5. 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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  5. A waveguide twist is used to change the plane of polarization.

    6. A.
    True
    B.
    False

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  6. Consider the following statements about directional coupler shown in the figure

    1. Ports 1 and 2 are decouple
    2. Ports 3 and 4 are decoupled
    3. Pots 1 and 3 are decoupled
    4. Ports 1 and 4 are decoupled
    Which of the above statements are correct?

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

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  7. In a multicavity klystron amplifier the electron velocity of the order of

    8. A.
    10 m/s
    B.
    103 m/s
    C.
    106 m/s
    D.
    1012 m/s

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  8. At a frequency equal to cutoff frequency in a rectangular wave guide

    9. A.
    the flow of electromagnetic energy is zero
    B.
    the flow of electromagnetic energy is infinite
    C.
    the flow of electromagnetic energy is 50% of maximum
    D.
    the flow of electromagnetic energy is 10% of maximum

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  9. Two identical hybrid tees are joined as shown in the given figure. If 16 mW power is fed into port 1, the power output at ports 2 , 3, 1', 2', 3' respectively is

    10. A.
    8, 4, 2, 2, 0 mW
    B.
    0, 8, 4, 4, 0 mW
    C.
    0, 8, 2, 2, mW
    D.
    8, 2, 4, 2, 0 mW

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  10. In a microwave resistor the wall thickness is made as small as possible to

    11. A.
    have high value of R
    B.
    have low value of R
    C.
    minimize capacitive effect
    D.
    reduce inductance

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