Test: Brewster Angle


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10 Questions MCQ Test Electromagnetic Fields Theory (EMFT) | Test: Brewster Angle

Test: Brewster Angle for Electrical Engineering (EE) 2023 is part of Electromagnetic Fields Theory (EMFT) preparation. The Test: Brewster Angle questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Brewster Angle MCQs are made for Electrical Engineering (EE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Brewster Angle below.
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Test: Brewster Angle - Question 1

Brewster angle is valid for which type of polarisation?

Detailed Solution for Test: Brewster Angle - Question 1

Answer: b
Explanation: The parallel polarisation of the electromagnetic waves is possible only when the transmission occurs at the Brewster angle.

Test: Brewster Angle - Question 2

The Brewster angle is expressed as 

Detailed Solution for Test: Brewster Angle - Question 2

Answer: c
Explanation: The tangent of the Brewster angle is the ratio of the refractive indices of the second medium to that of the first medium. It is given by tan θb= n2/n1. Thus the Brewster angle will be θb = tan-1(n2/n1).

Test: Brewster Angle - Question 3

The refractive index of a material with permittivity 16 is given by

Detailed Solution for Test: Brewster Angle - Question 3

Answer: c
Explanation: The refractive index is the square root of the permittivity. Thus n = √ε. Given that ε = 16, we get refractive index as n = 4. It has no unit.

Test: Brewster Angle - Question 4

The reflection coefficient in the wave propagation when it is transmitted with the Brewster angle is

Detailed Solution for Test: Brewster Angle - Question 4

Answer: a
Explanation: Brewster angle propagation refers to complete transmission. The wave transmitted at the Brewster angle will be completely transmitted without reflection. Thus the reflection coefficient will be zero.

Test: Brewster Angle - Question 5

The transmission coefficient of a wave propagating in the Brewster angle is

Detailed Solution for Test: Brewster Angle - Question 5

Answer: b
Explanation: The transmission coefficient is the reverse of the reflection coefficient. At Brewster angle, the reflection will be zero. Thus the transmission is T = 1-R. Since R = 0, T = 1. It is to be noted that T and R lies in the range of 0 to 1.

Test: Brewster Angle - Question 6

A circularly polarised wave transmitted at the Brewster angle will be received as linearly polarised wave. State True/False

Detailed Solution for Test: Brewster Angle - Question 6

Answer: a
Explanation: The Brewster angle is said to be the polarisation angle. When a circularly polarised wave is incident at the Brewster angle, the resultant wave will be linearly polarised.

Test: Brewster Angle - Question 7

An elliptically polarised wave transmitted at the Brewster angle will be received as an elliptically polarised wave. State True/False

Detailed Solution for Test: Brewster Angle - Question 7

Answer: b
Explanation: Any polarised wave transmitted at the Brewster angle will be linearly polarised. It can be a parallel, perpendicular, circular or elliptical polarisation. The resultant wave is always linearly polarised. This is the reason why the Brewster angle is called polarisation angle.

Test: Brewster Angle - Question 8

Find the Brewster angle of a wave transmitted from a medium of permittivity 4 to a medium of permittivity 2.

Detailed Solution for Test: Brewster Angle - Question 8

Answer: a
Explanation: The Brewster angle is given by θb = tan-1(n2/n1), where n = √ε. Thus we can express the formula in terms of permittivity as θb = tan-1√ (ε 2/ε 1). Here ε1 = 4 and ε2 = 2. Thus we get θb = tan-1√ (2/4) =
tan-1(0.707) = 35.26 degree.

Test: Brewster Angle - Question 9

Find the ratio of refractive index of medium 2 to that of medium 1, when the Brewster angle is 60 degree.

Detailed Solution for Test: Brewster Angle - Question 9

Answer: d
Explanation: The tangent of the Brewster angle is the ratio of the medium 2 permittivity to the medium 1 permittivity. Thus tan θb = (n2/n1). Given that θb = 60 degree, the ratio n2/n1 will be tan 60 = 1.732.

Test: Brewster Angle - Question 10

The Brewster angle is the angle of

Detailed Solution for Test: Brewster Angle - Question 10

Answer: a
Explanation: The Brewster angle is the angle of incidence at which complete transmission of the electromagnetic wave occurs.

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