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-9 section-3

The displacement current can be represented as

A) $${i_d} = {\mu _0}\frac{{d{\phi _E}}}{{dt}}$$ B) $${i_d} = { \in _0}\frac{{d{\phi _E}}}{{dt}}$$ C) $${i_d} = {\mu _0}\frac{{d{\phi _B}}}{{dt}}$$ D) $${i_d} = { \in _0}\frac{{d{\phi _B}}}{{dt}}$$

Discuss

Answer & Solution

Answer: Option B

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

What is the value of the magnetic vector potential due to an infinitesimally small current element, evaluated at infinite distance from it?

A) Infinity B) Unity C) Zero D) Any number between zero and infinity depending on the strength of the current element

Discuss

Answer & Solution

Answer: Option C

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

A steel pipe is constructed of a material for which µ_r = 200 and σ = 5 × 10⁶ mho/m. The outer and inner radii are 8 and 6 mm respectively and the length is 80 m. If the total current carried by the pipe is 2cos10⁴πt A,Then the skin depth will be

A) 0.225 × 10^-3 m B) 0.300 × 10^-3 m C) 0.352 × 10^-3 m D) 0.125 × 10^-3 m

Discuss

Answer & Solution

Answer: Option A

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

If the short circuit and open circuit impedance of a line are 5 Ω and 20 Ω respectively the characteristic impedance is given by

A) 100 Ω B) 10 Ω C) 15 Ω D) 10000 Ω

Discuss

Answer & Solution

Answer: Option B

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

The characteristic impedance of a co-axial cable depends on diameter of

A) inner conductor B) outer conductor C) both inner & outer conductors D) none of these

Discuss

Answer & Solution

Answer: Option C

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

In general attenuation per unit length in a coaxial cable:

A) increases with frequency B) decreases with frequency C) remains constant with frequency D) depends upon the type of coaxial cable. It can either increase or decrease

Discuss

Answer & Solution

Answer: Option A

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

What would be the standing wave ratio (SWR) for a line with reflection coefficient equal to 0.49?

A) 0.01 B) 2.12 C) 2.921 D) 3.545

Discuss

Answer & Solution

Answer: Option C

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

When a plane electromagnetic wave is incident normally on the boundary between two lossless dielectric media, the transmission coefficient for magnetic field intensity $$\overrightarrow H $$ is

A) $$\frac{{{n_1} - {n_2}}}{{{n_1} + {n_2}}}$$ B) $$\frac{{{n_2} - {n_1}}}{{{n_1} + {n_2}}}$$ C) $$\frac{{2{n_2}}}{{{n_1} + {n_2}}}$$ D) $$\frac{{2{n_1}}}{{{n_1} + {n_2}}}$$

Discuss

Answer & Solution

Answer: Option C

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

The potential at the centroid of an equilateral triangle of side $$r\sqrt 3 $$ due to three equal positive point charges each of value q and placed at the vertices of the triangle would be:

A) $$\frac{q}{{2\pi { \in _0}r}}$$ B) $$\frac{{\sqrt {3q} }}{{8\pi { \in _0}r}}$$ C) $$\frac{{3q}}{{4\pi { \in _0}r}}$$ D) Zero

Discuss

Answer & Solution

Answer: Option C

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

Consider the following statements:
For a 10 m long common power line connecting a switch to a light bulb
1. It is distributed circuit
2. Time delay for propagation through it is negligible
3. It is in the form of a shielded coaxial cable of circular cross-section
4. As the intensity of the lamp varies, input impedance of this line also changes
Which of the above statements is/are correct?

A) 1 only B) 1 and 2 C) 2 and 3 D) 2 and 4

Discuss

Answer & Solution

Answer: Option D

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