Electromagnetic Field Theory MCQ Questions & Answers

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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-3 section-2

Each section contains 100 MCQs on Electromagnetic Field Theory .

Consider a solid sphere of radius 5 cm made of a perfect electric conductor. If one million electrons are added to this sphere, these electrons will be distributed:

A) Uniformly over the entire volume of the sphere B) Uniformly over the outer surface of the sphere C) Concentrated around the centre of the sphere D) Along a straight line passing through the centre of the sphere

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

The divergence of magnetic flux density is

A) 1 B) ρ C) 0 D) ∞

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Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

A lossless transmission line is 100 cm long operate at 400 MHz. The line parameters are L = 0.49 µH/M and C = 100 pf. Find the phase constant and phase velocity.

A) β = 17.58 rad/m, V_P = 1.43 × 10⁸ m/sec B) β = 8.79 rad/m, V_P = 2.85 × 10⁸ m/sec C) β = 5.56 rad/m, V_P = 4.52 × 10⁸ m/sec D) β = 170 rad/m, V_P = 1.47 × 10⁸ m/sec

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Given a range of frequencies, which of the following system is best for transmission line load matching?

A) Single stub B) Double stub C) Single stub with adjustable position D) Quarter wave transformer

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

The dominant mode in a waveguide is characterized by

A) longest cutoff wavelength B) shortest frequency C) infinite attenuation D) zero attenuation

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Answer & Solution

Answer: Option A

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Electric displacement current density D at any point on a spherical surface of radius r centred at the isolated charge q is:

A) $$\frac{{{q^2}}}{{{r^2}}}$$ B) $$\frac{q}{{{r^2}}}$$ C) $$\frac{q}{{4\pi {r^2}}}$$ D) $$\frac{q}{{4{\pi ^2}{r^2}}}$$

Discuss

Answer & Solution

Answer: Option C

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Due to polarization.

A) The effective area of the electrode is reduced B) A local positive change is built up in the electrolyte, which repels the positive hydrogen ions away from the copper electrode C) A gas of hydrogen collects around the zinc stopping the conduction D) Both A and B

Discuss

Answer & Solution

Answer: Option D

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Magnetic flux can be measured by:

A) capacitive pick-up B) inductive pick-up C) resistive pick-up D) hall-effect pick-up

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Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

A theorem that relates surface integral with the volume integral is called

A) Stoke's theorem B) Gauss-divergence theorem C) Carnot's theorem D) Maximum power transfer theorem

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Answer & Solution

Answer: Option B

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When a load resistance RL is connected to a lossless transmission line of characteristic impedance 75 Ω. It results in a VSWR of 2. The load resistance is

A) 100 Ω B) 75 $$\sqrt 2 $$ Ω C) 120 Ω D) 150 Ω

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

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Electromagnetic Field Theory MCQ Questions & Answers | ECE