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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. Klystron amplifier is not used to amplifier very weak microwave signals due to

    2. A.
    low gain for weak signals
    B.
    low noise for weak signals
    C.
    high noise
    D.
    both (a) and (b)

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  2. Which of the following modes in circular waveguides are circularly symmetric?

    3. A.
    TE01
    B.
    TE02
    C.
    both (a) and (b)
    D.
    neither (a) nor (b)

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  3. Which of the following lines behaves as infinite line?

    4. A.
    a line terminated in inductance
    B.
    a line terminated in capacitance
    C.
    a short line
    D.
    a line terminated in z0

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  4. A rectangular waveguide has two stubs each length connected at the source end. The stubs are short circuted. Then

    5. A.
    the longitudinal current is power current and current in stubs is reactive
    B.
    the longitudinal current is reactive current and current in stubs is power current
    C.
    both power and reactive exists in both longitudinal direction and stubs
    D.
    the current in stubs is zero

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  5. Performance of a PIN diode switch is represented by

    6. A.
    insertion loss when switch is off
    B.
    insertion loss when switch is on
    C.
    insertion loss when switch is on and isolation loss when switch is off
    D.
    insertion loss when switch is off and isolation loss when switch is on

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  6. A circular waveguide has an infinite set of TE and TM modes.

    7. A.
    True
    B.
    False

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  7. In TE and TM modes of rectangular waveguides having propagation in z direction

    8. A.
    Ez and Hz are both zero
    B.
    In TE mode Ez is zero and in TM mode Hz is zero
    C.
    In TE mode Hz is zero and in TM mode Ez is zero
    D.
    In both TE and TM modes both Ez and Hz are non-zero

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  8. Which of the following are true for magic tee in the given figure select the answer as per given codes

    1. S13 = S23
    2. S14 = S24
    3. S12 = 0
    4. S34 = 0

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

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  9. The manufacturing technique used to manufacture strip type transmission line is

    10. A.
    photoetching technique
    B.
    oxidation technique
    C.
    cladding
    D.
    epitaxial

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  10. An electromagnetic wave can be completely guided by a dielectric rod or slab.

    11. A.
    True
    B.
    False

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