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On which factor dominant mode of a waveguide depends?

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in Analog Communications by (122k points)
On which factor dominant mode of a waveguide depends?

(a) shape

(b) power

(c) direction

(d) bandwidth

I had been asked this question during a job interview.

The above asked question is from ZCD topic in division Angle Modulation of Analog Communications

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Right answer is (a) shape

For explanation I would say: A waveguide is something that guides waves, such as electromagnetic wave or sound with minimum loss of energy. The dominant mode of a waveguide depends on the shape of the waveguide.

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