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ECE :: Microwave Engineering

  1. Which of the following is the major advantage of Travelling wave tube over Klystron
  2. A.
    Higher gain
    B.
    Higher frequency
    C.
    Higher Output
    D.
    Higher bandwidth

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  3. Due to the curvature of earth, microwave repeaters are placed at a distance of about
  4. A.
    10 km
    B.
    50 km
    C.
    150 km
    D.
    250 km

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  5. At Microwave frequencies , the size of the antenna becomes
  6. A.
    Very large
    B.
    Large
    C.
    Small
    D.
    Very Small

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  7. Which of the following noise becomes important at microwave frequencies
  8. A.
    Shot noise
    B.
    Flicker noise
    C.
    Thermal noise
    D.
    Transit time noise

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  9. The phenomenon of microwave signals following the curvature of earth is known as _______
  10. A.
    Faraday effect
    B.
    Ducting
    C.
    Wave tilt
    D.
    Troposcatter

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  11. In Microwave communication links, The rain drop attenuation experienced is mainly due to
  12. A.
    Absorption of microwave energy by water vapour
    B.
    Resonance absorption of atomic vibration in water molecules
    C.
    Scattering of microwaves by collection of water drops
    D.
    Refraction of microwaves through liquid drop lenses formed by rain

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  13. The key difference between circuit theory and transmission line theory is:
  14. A.
    circuit elements
    B.
    voltage
    C.
    current
    D.
    electrical size

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  15. Transmission line is a _________ parameter network.
  16. A.
    lumped
    B.
    distributed
    C.
    active
    D.
    none of the mentioned

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  17. For transverse electromagnetic wave propagation, we need a minimum of:
  18. A.
    1 conductor
    B.
    2 conductors
    C.
    3 conductors
    D.
    bunch of conductors

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