Electromagnetic theory miscellaneous


Electromagnetic theory miscellaneous

Electromagnetic Theory

  1. A piston attenuator is a—
    1. Vane attenuator
    2. Waveguide below cut-off
    3. Mode filter
    4. Flap attenuator

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    A piston attenuator is a waveguide below the cut-off.

    Correct Option: B

    A piston attenuator is a waveguide below the cut-off.


  1. Which one of the following waveguide tuning components are not easily adjustable?
    1. Screw
    2. Stub
    3. Iris
    4. Plunger

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    NA

    Correct Option: C

    NA



  1. In order to couple two generators to a waveguide system without coupling them to each other, one could not use a—
    1. Rat-race
    2. E-plane T
    3. Hybrid ring
    4. Magic T

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    NA

    Correct Option: B

    NA


  1. A choke flange may be used to couple two waveguides—
    1. To help in the alignment of the waveguides
    2. Because it is simpler than any other join
    3. To compensate for discontinuities at the join
    4. To increase the bandwidth of the system

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    NA

    Correct Option: C

    NA



  1. The dominant mode of propagation is preferred with rectangular waveguides because— (indicate false statement)
    1. It leads to the smallest waveguide dimensions
    2. The resulting impedance can be matched directly to coaxial lines
    3. It is easier to excite than the other modes
    4. Propagation of it without any spurious generation can be ensured

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    NA

    Correct Option: B

    NA