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GATE EC 2021: Electromagnetics Quiz 10

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Question 1

The modes in a rectangular waveguide are denoted by TEmn/TMmn where m and n are the eigen numbers along the larger and smaller dimensions of the waveguide respectively. Which one of the following statements is TRUE?

Question 2

A rectangular waveguide of internal dimensions (a = 4 cm and b = 3) is to be operated TE11 mode. The minimum operating frequency is

Question 3

The longitudinal component of the magnetic field inside an air-filled rectangular waveguide made of a perfect electric conductor is given by the following expression
Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE EC 10-Mar\GATE-ECE-2015-Paper-1_files\image293.png (A/m)
The cross-sectional dimensions of the waveguide are given as a = 0.08 m and b = 0.033 m. The mode of propagation inside the waveguide is

Question 4

A rectangular waveguide having TE10 mode as dominant mode is having a cutoff frequency of 18-GHz for the TE30 mode. The inner broad-wall dimension of the rectangular waveguide is:

Question 5

A rectangular metal wave–guide filled with a dielectric material of relative permittivity has the inside dimensions . The cut–off frequency for the dominant mode is

Question 6

A circular waveguide carries mode whose radial electric –field is given by

Where r is radial distance in cm from the waveguide axis
Cut off wavelength of this mode is
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Oct 21ESE & GATE EC