# Electromagnetics [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 48 - 52 of 96

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## Question 48

Electromagnetics
Equations

### Question

MCQ▾

For a rectangular waveguide of internal dimensions , the cut – off frequency for the mode is the arithmetic mean of the cut – off frequencies for mode and mode. If . the value of is … .

### Choices

Choice (4)Response

a.

3 cm

b.

4 cm

c.

2 cm

d.

All of the above

## Question 49

Electromagnetics
Equations

### Question

MCQ▾

Consider an air – filled rectangular waveguide with dimensions and . At operating frequency, the value of the propagation constant (per meter) of the corresponding propagation mode is ________

### Choices

Choice (4)Response

a.

b.

c.

d.

All of the above

## Question 50

Electromagnetics
Equations

### Question

MCQ▾

The magnetic field along the propagation direction inside a rectangular waveguide with the cross section shown in the figure is

The phase velocity of the wave inside the waveguide satisfies

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 51

Electromagnetics
Equations

### Question

MCQ▾

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

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 52

Electromagnetics
Equations

### Question

MCQ▾

Consider an air – filled rectangular waveguide with dimensions and . The increasing order of the cut – off frequency for different modes is

### Choices

Choice (4)Response

a.

b.

c.

d.

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