Electromagnetic Field Theory MCQ Questions & Answers

Electromagnetic Field Theory MCQ Questions & Answers | ECE

Learn Electromagnetic Field Theory MCQ questions & answers are available for a Electronics and Communications Engineering(ECE) students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Electromagnetic Field Theory MCQ question is the important chapter for a Electronics and Communications Engineering(ECE) and GATE students. Page-8 section-1

Which one of the following statements is correct?

A) Both Lapace's and Poisson's equation are non-linear equations B) Laplace's equation is non-linear but Poisson's equation is linear C) Laplace's equation is linear but Poisson's equation is non-linear D) Both Lapace's and Poisson's equations are linear

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Answer & Solution

Answer: Option C

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When compared with stripline, the major disadvantage of microstrip line is

A) Not amenable for printed circuit technique B) More expensive and complex to manufacture C) Bulkier and voluminous D) More likely to radiate

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Answer: Option D

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Some unknown material has a conductivity 10⁶ mho/m and a permeability of 4π × 10^-7 H/m. The skin depth for the material at 1 GHz is

A) 15.9 µm B) 20.9 µm C) 25.9 µm D) 30.9 µm

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Answer: Option A

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Match List-I with List-II and select the correct answer using the options given below:

List-I (Load impedance)	List-II (Value of Reflection Coefficient)
a. Short circuit	1. 0
b. Open Circuit	2. -1
c. Line characteristic impedance	3. +1
d. 2 × line characteristic impedance	4. $$ + \frac{1}{3}$$

A) a-2, b-1, c-3, d-4 B) a-4, b-3, c-1, d-2 C) a-2, b-3, c-1, d-4 D) a-4, b-1, c-3, d-2

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Answer: Option C

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The conducting thin coils X and Y (identical except for a thin cut in coil Y) are placed in a uniform magnetic field which is decreasing at a constant rate. If the plane of the coils is perpendicular to the field lines, which of the following statement is correct? As a result, emf is induced in:

A) both the coils B) coil Y only C) coil X only D) None of the two coils

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Answer: Option A

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Who developed the concept of time varying electric field producing a magnetic field?

A) Gauss B) Faraday C) Hertz D) Maxwell

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Answer: Option B

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Electromagnetic waves are produced by

A) A static charge B) A moving charge C) An accelerating charge D) Chargeless particle

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Answer: Option C

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The characteristic impedance of a cable is about

A) 2 B) 5 C) 50 D) 300

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Answer: Option C

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The VSWR of a microwave unit is 1.5, the return loss is:

A) 14 dB B) 16 dB C) 18 dB D) 11 dB

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Answer & Solution

Answer: Option A

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A medium is divided into regions I and II about x = 0 plane, as shown in the figure below. An electromagnetic wave with electric field $${\overrightarrow E _1} = 4{{\hat a}_x} + 3{{\hat a}_y} + 5{{\hat a}_z}$$ is incident normally on the interface from region-I. The electric field $${\overrightarrow E _2}$$ in region-II at the interface is
Electromagnetic Field Theory mcq question image

Electromagnetic Field Theory mcq question image

A) $${\overrightarrow E _2} = {\overrightarrow E _1}$$ B) $$4{{\hat a}_x} + 0.75{{\hat a}_y} - 1.25{{\hat a}_z}$$ C) $$3{{\hat a}_x} + 3{{\hat a}_y} + 5{{\hat a}_z}$$ D) $$ - 3{{\hat a}_x} + 3{{\hat a}_y} + 5{{\hat a}_z}$$

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Answer & Solution

Answer: Option C

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