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-6 section-3

An electromagnetic wave is transmitted into a conducting medium of conductivity ?. The depth of penetration is

A) directly proportional to frequency B) directly proportional to square root of frequency C) inversely proportional to frequency D) inversely proportional to square root of frequency

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Answer: Option D

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What is the effect of the earth's magnetic field in the reflected wave at frequencies in the vicinity of gyro-frequency?

A) No attenuation in the reflected wave B) Decreased attenuation in the reflected wave C) Increased attenuation in the reflected wave D) Nominal attenuation in the reflected wave

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Answer: Option C

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For free space E = 50 cos(10⁸t + βx), then the value of β . . . . . . . .

A) 0.3333 rad/m B) $$\frac{2}{3}$$ C) $$\frac{4}{3}$$ D) 0.316

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Answer: Option A

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The value of flux linkage is 6t³ at time t = 2 seconds. What is the emf of a material?

A) 70 units B) 50 units C) 36 units D) 72 units

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Answer: Option D

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The depth of penetration of electromagnetic wave in a medium having conductivity σ at a frequency of 1 MHz is 25 cm. The depth of penetration at a frequency of 4 MHz will be

A) 6.25 cm B) 12.50 cm C) 50.00 cm D) 100.00 cm

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Answer: Option B

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In a transmission line with ωL >> R and ωC >> G, Phase Shift constant β is proportional to

A) ω B) ω² C) $$\sqrt \omega $$ D) $$\frac{1}{{\sqrt \omega }}$$

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Answer: Option A

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In electromagnetic waves, polarisation is

A) due to transverse nature of waves B) always vertical in isotropic medium C) due to longitudinal nature of waves D) caused by reflection of waves

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Answer: Option A

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The line impedance at voltage minimum is

A) Resistive B) Capacitive C) Inductive D) Complex

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Answer: Option A

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For a plane wave propagating in an unbounded medium (say, free space), the minimum angle between electric field and magnetic field vectors is

A) 0° B) 60° C) 90° D) 180°

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Answer: Option C

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An infinitely long uniform charge of density 30 nC/m is located at y = 3, z = 5. The field intensity at (0, 6, 1) is E = 64.7a_y - 86.3a_z V/m. What is the field intensity at (5, 6, 1)?

A) $$E$$ B) $$\left( {\frac{{{6^2} + {1^2}}}{{{5^2} + {6^2} + {1^2}}}} \right)E$$ C) $${\left( {\frac{{{6^2} + {1^2}}}{{{5^2} + {6^2} + {1^2}}}} \right)^{\frac{1}{2}}}E$$ D) $${\left( {\frac{{{5^2} + {6^2} + {1^2}}}{{{6^2} + {1^2}}}} \right)^{\frac{1}{2}}}E$$

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Answer: Option A

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