# Electromagnetics [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 67 - 70 of 96

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## Question 67

Electromagnetics
Characteristic Impedance

Appeared in Year: 2010

### Question

MCQ▾

A transmission line has a characteristic impedance of 50Ω and a resistance of 0.1 Ω /m. if the line is distortion less, the attenuation constant (in ) is

### Choices

Choice (4)Response

a.

500

b.

5

c.

0.002

d.

0.014

## Question 68

Electromagnetics
Equations

Appeared in Year: 2019

### Question

MCQ▾

A rectangular waveguide of width and height has cut-off frequencies for and modes in the ratio . The aspect ratio , rounded off to two decimal places, is________ (Carry One Mark Each)

### Choices

Choice (4)Response

a.

1.782

b.

1.732

c.

2.732

d.

None of the above

## Question 69

Electromagnetics
Equations

### Question

MCQ▾

The cut off frequency of waveguide depends upon

### Choices

Choice (4)Response

a.

The dimensions of the waveguide.

b.

The electric property of the medium in the waveguide

c.

The transverse and axial components of the fields

d.

The characteristic impedance of the waveguide

## Question 70

Electromagnetics
Impedance Transformation

Appeared in Year: 2015

### Question

MCQ▾

The longitudinal component of the magnetic field inside an air-filled rectangular waveguide made of a perfect electric conductor is given by the following expression

The cross – sectional dimension of the waveguide is given as and . The mode of propagation inside the waveguide is

### Choices

Choice (4)Response

a.

b.

c.

d.

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