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Electronics and Communication Engineering (ECE) Exam  >  Electronics and Communication Engineering (ECE) Tests  >  Test: Types of Waveguides & Its Properties - Electronics and Communication Engineering (ECE) MCQ

Test: Types of Waveguides & Its Properties - Electronics and Communication Engineering (ECE) MCQ


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20 Questions MCQ Test - Test: Types of Waveguides & Its Properties

Test: Types of Waveguides & Its Properties for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) 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) 2024 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
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The phenomenon employed in the waveguide operation is

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

Answer: c
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
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The dominant mode in waveguide is the mode which has

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

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

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Test: Types of Waveguides & Its Properties - Question 3
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The modes are calculated from which parameter?

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

Answer: d
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
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The circular waveguides use which function in the frequency calculation?
Detailed Solution for Test: Types of Waveguides & Its Properties - Question 4

Answer: c
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
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The scattering parameters are used to indicate the
Detailed Solution for Test: Types of Waveguides & Its Properties - Question 5

Answer: c
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
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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

Answer: a
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
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For the matched line, the parameters S12 and S21 are 
Detailed Solution for Test: Types of Waveguides & Its Properties - Question 7

Answer: b
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
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The waveguides are materials with characteristics of
Detailed Solution for Test: Types of Waveguides & Its Properties - Question 8

Answer: a
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
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The parameters S11 and S22 indicate the transmission coefficients. State true/false.
Detailed Solution for Test: Types of Waveguides & Its Properties - Question 9

Answer: a
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
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The waveguides increase the transmission of the electromagnetic waves. State true/false.
Detailed Solution for Test: Types of Waveguides & Its Properties - Question 10

Answer: a
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
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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

Answer: d
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
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The cut off frequency for a waveguide to operate is
Detailed Solution for Test: Types of Waveguides & Its Properties - Question 12

Answer: d
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
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In rectangular waveguides, the dimensions a and b represent the
Detailed Solution for Test: Types of Waveguides & Its Properties - Question 13

Answer: b
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
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The Bessel function is denoted by 
Detailed Solution for Test: Types of Waveguides & Its Properties - Question 14

Answer: a
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
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In a waveguide, always which condition holds good?
Detailed Solution for Test: Types of Waveguides & Its Properties - Question 15

Answer: b
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
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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

Answer: a
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
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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

Answer: d
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
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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

Answer: c
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
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The modes in a material having a V number of 20 is
Detailed Solution for Test: Types of Waveguides & Its Properties - Question 19

Answer: c
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
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The number of modes is given as 50, find the V number.
Detailed Solution for Test: Types of Waveguides & Its Properties - Question 20

Answer: b
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.

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