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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. The expression HZ = C cos(Bx) cos(Ay)yz is for

    2. A.
    TE wave
    B.
    TM waves
    C.
    both TE and TM waves
    D.
    some TE and some TM waves

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  2. Assertion (A): Impedance matching can be done by using stubs.

    Reason (R): A double stub is used for impedance matching when frequency of signal varies.

    3. 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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  3. Read the following statements about TWT

    1. It uses thermionic emission.
    2. It uses an attenuater.
    3. It is inherently a resonant device.
    4. It has broad bandwidth.
    Which of the above are correct?

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

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  4. If a line having Z0 = 300 ∠ 0 W is short circuited at far end, VSWR is

    5. A.
    0 
    B.
    1
    C.
    ∞
    D.
    2

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  5. A klystron amplifier generally uses Pierce gun

    6. A.
    True
    B.
    False

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  6. Assertion (A): PIN diode is used as a fast switch.

    Reason (R): PIN diode has very high resistance when reverse biased and very low resistance when forward biased.

    7. 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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  7. A pulsed radar produces 1 μ sec pulses at a rate of 1000 per second. The duty cycle is

    8. A.
    0.001
    B.
    0.01
    C.
    0.1
    D.
    1

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  8. Assertion (A): Impedance measurement at microwave frequencies is done by finding SWR.

    Reason (R): SWR and reflection coefficient depend on the characteristic impedance and load impedance.

    9. 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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  9. When a line is loaded the characteristic impedance is equal to

    10. A.
    (R + jωL)(G + jωC)
    B.
    C.
    D.
    LC

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  10. Which device has internal positive feedback?

    11. A.
    Two cavity klystron amplifier
    B.
    Multi-cavity klystron amplifier
    C.
    Reflex klystron amplifier
    D.
    All of the above

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