# GATE (Graduate Aptitude Test in Engineering) Electronics: Questions 665 - 669 of 1076

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## Question 665

### Question

MCQ▾

Indicate which one of the following modes do NOT exist in a rectangular resonant cavity

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 666

### Question

MCQ▾

A rectangular waveguide has dimensions . Its cut off frequency is

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 667

### Question

MCQ▾

An air – filled rectangular waveguide of internal dimension a has a cut off frequency of for the dominant mode. For the same waveguide, if the cutoff frequency of the mode is , the frequency of the mode is ________

### Choices

Choice (4)Response

a.

b.

c.

d.

Question does not provide sufficient data or is vague

## Question 668

### Question

MCQ▾

The modes of rectangular waveguide are denoted by when m and n are Eigen numbers along the larger and smaller dimensions of the waveguide respectively. Which one of the following statement is true.

### Choices

Choice (4)Response

a.

The mode of waveguide does not exist.

b.

The mode of waveguide does not exist.

c.

The and modes both exist and have same cut off frequency.

d.

The and modes both exist and have same cut off frequency

## Question 669

### Question

MCQ▾

A rectangular waveguide of internal dimensions is to be operated in mode. The minimum operating frequency is

### Choices

Choice (4)Response

a.

b.

c.

d.

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