Electromagnetics [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 39 - 43 of 96

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Question 39

Electromagnetics
Equations

Question

MCQ▾

Choose the correct statements for a wave propagating in an air filled rectangular waveguide

Choices

Choice (4)Response

a.

Phase velocity is never less than the free space velocity.

b.

TEM mode is possible if the dimensions of the waveguide are properly chosen.

c.

Guided wavelength is never less than free space wavelength.

d.

Both c. and a. are correct

Question 40

Electromagnetics
Equations

Question

MCQ▾

A rectangular air – filled waveguide has a cross section of the minimum frequency which can propagation in the waveguide is

Choices

Choice (4)Response

a.

b.

c.

d.

Question 41

Electromagnetics
Equations

Question

MCQ▾

Which one of the following does represent the electric field lines for the mode in the cross – section of a hollow rectangular metallic waveguide?

Choices

Choice (4)Response

a.

b.

c.

d.

Question 42

Electromagnetics
Equations

Question

MCQ▾

The phase velocity of waves propagation in hollow metal waveguide is

Choices

Choice (4)Response

a.

Greater than velocity of light in free space

b.

Less than velocity of light in free space

c.

Equal to velocity of light in free space

d.

Equal to group velocity

Question 43

Electromagnetics
Equations

Question

MCQ▾

The dominant mode in a rectangular waveguide is because this mode has

Choices

Choice (4)Response

a.

No attenuation

b.

No cut off

c.

No magnetic field component

d.

The highest cut off wavelength

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