Test: Types of Waveguides & Its Properties

# Test: Types of Waveguides & Its Properties

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## 20 Questions MCQ Test Electromagnetic Fields Theory (EMFT) | Test: Types of Waveguides & Its Properties

Test: Types of Waveguides & Its Properties for Electronics and Communication Engineering (ECE) 2023 is part of Electromagnetic Fields Theory (EMFT) preparation. The Test: Types of Waveguides & Its Properties questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Types of Waveguides & Its Properties MCQs are made for Electronics and Communication Engineering (ECE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Types of Waveguides & Its Properties below.
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Test: Types of Waveguides & Its Properties - Question 1

### The phenomenon employed in the waveguide operation is

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 1

Explanation: The waveguides use total internal reflection phenomenon to transmit the waves passing through it. Thus the acceptance angle and critical angle are important for effective transmission.

Test: Types of Waveguides & Its Properties - Question 2

### The dominant mode in waveguide is the mode which has

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 2

Explanation: The dominant mode is the mode which has the minimum frequency or maximum wavelength available for propagation of the waves

Test: Types of Waveguides & Its Properties - Question 3

### The modes are calculated from which parameter?

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 3

Explanation: The modes are calculated from the V number of the waveguides. It is given by M= V2/2.

Test: Types of Waveguides & Its Properties - Question 4

The circular waveguides use which function in the frequency calculation?

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 4

Explanation: The circular or cylindrical waveguides use the Bessel function for the frequency calculation of a particular mode.

Test: Types of Waveguides & Its Properties - Question 5

The scattering parameters are used to indicate the

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 5

Explanation: The scattering matrix consists of the transmission coefficients in the main diagonal and the reflection coefficients in the opposite diagonal.

Test: Types of Waveguides & Its Properties - Question 6

Which of the following two parameter models cannot be used to represent a transmission line?

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 6

Explanation: The T, ABCD and S parameter models are used in the transmission line modelling. The h parameter is not used for the same.

Test: Types of Waveguides & Its Properties - Question 7

For the matched line, the parameters S12 and S21 are

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 7

Explanation: The parameters S12 and S21 are the reflection coefficients. For a matched line, the reflection coefficients are zero. Thus the parameters S12 and S21 are also zero.

Test: Types of Waveguides & Its Properties - Question 8

The waveguides are materials with characteristics of

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 8

Explanation: Generally, the waveguides are made of materials with low bulk resistivity like brass, copper, silver etc. But if the interior walls are properly plated, it is possible with poor conductivity materials too. It is even possible to make plastic waveguides.

Test: Types of Waveguides & Its Properties - Question 9

The parameters S11 and S22 indicate the transmission coefficients. State true/false.

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 9

Explanation: In a scattering matrix, the parameters S11 and S22 indicate the transmission coefficients and the parameters S21 and S12 indicate the reflection coefficients.

Test: Types of Waveguides & Its Properties - Question 10

The waveguides increase the transmission of the electromagnetic waves. State true/false.

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 10

Explanation: The waveguides aid in effective transmission of the electromagnetic power from the source antenna to the destination antenna.

Test: Types of Waveguides & Its Properties - Question 11

The waveguide is employed in the transmission lines, when operated at the range of

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 11

Explanation: Waveguides are employed for effective transmission, when the lines carry electromagnetic waves in the GHz range.

Test: Types of Waveguides & Its Properties - Question 12

The cut off frequency for a waveguide to operate is

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 12

Explanation: The cut off frequency of the waveguide is 6 GHz. This is the frequency at which the waveguide will start to operate.

Test: Types of Waveguides & Its Properties - Question 13

In rectangular waveguides, the dimensions a and b represent the

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 13

Explanation: In rectangular waveguide, the a parameter is the broad wall dimension of the waveguide and the b parameter is the side wall dimension of the waveguide. Always, a > b in a waveguide.

Test: Types of Waveguides & Its Properties - Question 14

The Bessel function is denoted by

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 14

Explanation: The Bessel function is used in the circular waveguides. Normally Jn(ha) = 0. Here n is the order of the Bessel function.

Test: Types of Waveguides & Its Properties - Question 15

In a waveguide, always which condition holds good?

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 15

Explanation: In air medium, the phase velocity is assumed to be the speed of light. For waveguides, the phase velocity is always greater than the speed of the light.

Test: Types of Waveguides & Its Properties - Question 16

The group wavelength is greater than the wavelength at any point. State true/false.

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 16

Explanation: In a waveguide, the phase velocity is greater than the velocity of light. Thus the group velocity will be less. This implies the group wavelength will be greater than the wavelength at any point.

Test: Types of Waveguides & Its Properties - Question 17

Find the group wavelength of a wave, given that the group phase constant is 6.28 units.

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 17

Explanation: The group wavelength is given by λg = 2π/βg, where βg is the group wavelength of the wave. On substituting for βg = 6.28, we get group wavelength as unity.

Test: Types of Waveguides & Its Properties - Question 18

The phase velocity of a wave with frequency of 15 radian/sec and group phase constant of 2 units is

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 18

Explanation: The phase velocity of a wave is given by Vp = ω/βg. on substituting for ω = 15 and βg = 2, we get phase velocity as 15/2 = 7.5 units.

Test: Types of Waveguides & Its Properties - Question 19

The modes in a material having a V number of 20 is

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 19

Explanation: The relation between the modes and the V number is given by m = v2/2. Given that v = 20, we get m = 202/2 = 200 modes

Test: Types of Waveguides & Its Properties - Question 20

The number of modes is given as 50, find the V number.

Detailed Solution for Test: Types of Waveguides & Its Properties - Question 20

Explanation: The relation between the modes and the V number is given by m = v2/2. Given that m = 50, we get v2 = 2 x 50 = 100. The V number is 10.

## Electromagnetic Fields Theory (EMFT)

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## Electromagnetic Fields Theory (EMFT)

11 videos|46 docs|62 tests