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-2 section-2

In a hundred-turn coil, if the flux through each turn is (t³ - 2t) mWb, the magnitude of the induced emf in the coil at a time of 4s is:

A) 46 mV B) 56 mV C) 4.6 V D) 5.6 V

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Answer & Solution

Answer: Option C

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A uniform plane electromagnetic wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What is the percentage of incident power that is reflected?

A) 10% B) 25% C) 50% D) 75%

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Answer & Solution

Answer: Option B

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Skin depth at 2 GHz for a gold conductor with σ = 4.55 × 10⁷ S/m is 1.5 µm. Skin depth (in µm) at 8 GHz & 18 GHz is:

A) 3.00, 4.50 B) 0.75, 0.50 C) 0.375, 0.055 D) 1.50, 1.00

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Answer: Option B

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The value of ∇.A; where \[A = 3xy{\overrightarrow a _x} + x{\overrightarrow a _y} + xyz{\overrightarrow a _z}\] at a point (2, -2, 2) is:

A) -10 B) -6 C) 2 D) 4

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Answer & Solution

Answer: Option A

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Which one of the following is caused by reflection from stratified atmosphere or from the surface or land conditions along the path?

A) Multipath fading B) Selective fading C) Duo fading D) Reflection fading

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Answer & Solution

Answer: Option A

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Polarization of dielectric materials results in

A) Production of eddy current B) Creation of dielectric dipoles C) Release of protons D) Absorption of electrons

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Answer & Solution

Answer: Option B

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The property of the material which oppose the creation of magnetic flux in it is called

A) reluctance B) conductance C) resistivity D) permeance

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Answer & Solution

Answer: Option A

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The capacitor is made with a polymeric dielectric having an ε_r of 2.26 and a dielectric breakdown strength of 50 KV/cm. The permittivity of free space is 8.85 pF/m. If the rectangular plates of the capacitor have a width of 20 cm and a length of 40 cm, then the maximum electric charge in the capacitor is

A) 2 µC B) 4 µC C) 8 µC D) 10 µC

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Answer & Solution

Answer: Option C

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If R = Earth's radius, h = orbit height, β = coverage angle, and θ = minimum elevation angle, then which one of the following relations is correct?

A) $$\frac{R}{{R + h}} = \frac{{\cos \left( {\beta + \theta } \right)}}{{\cos \left( \theta \right)}}$$ B) $$\frac{R}{h} = \frac{{\cos \left( \beta \right)}}{{\cos \left( \theta \right)}}$$ C) $$\frac{h}{R} = \frac{{\cos \left( {\beta + \theta } \right)}}{{\cos \left( \beta \right)}}$$ D) $$\frac{{R + h}}{h} = \cos \left( {\beta + \theta } \right) - \cos \left( \theta \right)$$

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Answer & Solution

Answer: Option A

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The value of the determinant \[\left| {\begin{array}{*{20}{c}} {\cos \theta }&\theta &{\sin \theta } \\ 0&1&0 \\ { - \sin \theta }&0&{\cos \theta } \end{array}} \right|\] is

A) 0 B) -1 C) 1 D) 2

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Answer & Solution

Answer: Option C

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