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

Access detailed explanations (illustrated with images and videos) to 1176 questions. Access all new questions- tracking exam pattern and syllabus. View the complete topic-wise distribution of questions. Unlimited Access, Unlimited Time, on Unlimited Devices!

View Sample Explanation or View Features.

Rs. 450.00 -OR-

## 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

### 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

Developed by: