Electromagnetics [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 44 - 47 of 96

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Question 44

Electromagnetics
Equations

Question

MCQ▾

An air filled rectangular waveguide has inner dimensions of . The wave impedance of the mode of propagation in the waveguide at a frequency of is (free space impedance ) .

Choices

Choice (4)Response

a.

b.

c.

d.

Question 45

Electromagnetics
Characteristic Impedance

Question

MCQ▾

The interior of rectangular waveguide is completely filled with a dielectric of . Waves of free space wave – length shorter than … can be propagated in the TE11 mode.

Choices

Choice (4)Response

a.

3 cm

b.

4

c.

1

d.

2

Question 46

Electromagnetics
Equations

Question

MCQ▾

Which of the following statement is true regarding the fundamental mode of the metallic waveguides shown

Que-9-P Coaxial
Que-9-Q Cylindrical
Que-9-R Rectangular

Choices

Choice (4)Response

a.

Only P has no cut off frequency

b.

Only Q has no cut off frequency

c.

Only R has no cut off frequency

d.

All three have cut off frequency

Question 47

Electromagnetics
Equations

Question

MCQ▾

For normal mode EM wave propagation in a hollow rectangular waveguide

Choices

Choice (4)Response

a.

The phase velocity is greater than group velocity.

b.

The phase velocity is less than the velocity of light in free space.

c.

The phase velocity may be either greater than or less than group velocity.

d.

Both c. and a. are correct

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