GATE ECE Rectangular and circular waveguides PYQs & Answers

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Rectangular and circular waveguides

Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.

Questions 1–5 of 5. Imported answers require independent review unless marked reviewed.

Topic practice 5 questionsPage 1 of 1

Radiation resistance of a small dipole current element of length

at a frequency of 3 GHz is 3 ohms. If the length is changed by 1%, then the percentage change in the radiation resistance, rounded off to two decimal places, is _____ %.

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The dispersion equation of a waveguide, which relates the wavenumber

to the frequency

, is

where the speed of light

m/s, and

is a constant. If the group velocity is

m/s, then the phase velocity is

Your answerChoose one option.

m/s

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A rectangular waveguide of width

and height

has cut-off frequencies for

and

modes in the ratio 1:2. The aspect ratio

, rounded off to two decimal places, is ______.

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The cutoff frequency of TE

mode of an air filled rectangular waveguide having inner dimensions

cm (

) is twice that of the dominant TE

mode. When the waveguide is operated at a frequency which is 25% higher than the cutoff frequency of the dominant mode, the guide wavelength is found to be 4 cm. The value of

(in cm, correct to two decimal places) is ______.

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A half wavelength dipole is kept in the

plane and oriented along 45° from the

-axis. Determine the direction of null in the radiation pattern for

. Here the angle

(

) is measured from the z-axis, and the angle

(

) is measured from the x-axis in the

plane.

Your answerChoose one option.

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GATE ECE Rectangular and circular waveguides PYQs

How to practice Rectangular and circular waveguides

Question 23

Question 37

Question 51

Question 48

Question 55