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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 magnetron requires an external magnetic field with flux lines parallel to axis of cathode

    2. A.
    True
    B.
    False

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  2. When a line short circuited at far end, the minimum voltage occurs at

    3. A.
    far end
    B.
    source end
    C.
    midway between source and far end
    D.
    none of the above

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  3. In a TWT the axial component of electric field advances along the tube

    4. A.
    at a velocity that is almost equal to speed of light
    B.
    at a velocity that is a small fraction of speed of light
    C.
    at a velocity that is about 50% of speed of light
    D.
    at a velocity that may be even more than speed of light

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  4. If other parameter are constant, transmission loss at 5 GHz as compared to that at 0.5 GHz is

    5. A.
    20 dB more
    B.
    20 dB less
    C.
    700 dB more
    D.
    100 dB less

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  5. For a circular wave guide

    6. A.
    cutoff frequency for TE10 and TE01 modes are same
    B.
    cutoff frequency for TE10 and TE01 modes are different
    C.
    cutoff frequency for TE10 mode = twice the cutoff frequency for TE20 mode
    D.
    cutoff frequency for TE10 mode = haf the cutoff frequency for TE20 mode

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  6. In the given figure the reflected voltage wave after first reflection is

    7. A.
    18 V
    B.
    -18 V
    C.
    30 V
    D.
    -30 V

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  7. Assertion (A): A half wavelength line can be used as a 1 : 1 transformer.

    Reason (R): The input impedance of a half wavelength line is equal to load impedance.

    8. 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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  8. The magnitudes of OC and SC input impedances of a transmission line an 100 Ω and 25 Ω. The characteristic impedance is

    9. A.
    25 Ω
    B.
    50 Ω
    C.
    75 Ω
    D.
    100 Ω

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  9. A loss less line is terminated in a circular lines are E lines

    10. A.
    SWR = 0
    B.
    SWE = 0
    C.
    SWR is finite
    D.
    SWR = ∞

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  10. Which of the following terminations makes the input impedance of a line equal to characteristic impedance Z0?

    11. A.
    line open circuited at far end
    B.
    line terminated in Z0
    C.
    line short circuited at far end
    D.
    line terminated in inductance

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