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-7 section-3

For loss less transmission line L = 0.35 µH/m, C = 90 pF/m and frequency = 500 MHz. Then the magnitude of the propagation constant is

A) 14.48 B) 17.63 C) 19.59 D) 21.20

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Answer: Option B

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The intrinsic impedance of free space is

A) 127 Ω B) 177 Ω C) 120 πΩ D) 177 Πω

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Answer: Option C

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The magnitude of Coulomb's force of repulsion between two alpha particles (helium ions) in space 10 mm apart is:

A) 92.16 × 10^-25nt B) 9.216 × 10^-25nt C) 46.08 × 10^-25nt D) 10 × 10^-27nt

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Answer: Option A

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If a transmission line terminated with a load equal to be characteristic impedance the reflection co-efficient is

A) +1 B) -1 C) 0 D) infinity

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Answer: Option C

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The group delay function τ(ω) is related to phase function φ(ω) as

A) $$\tau \left( \omega \right) = - \frac{{d\phi \left( \omega \right)}}{{d\omega }}$$ B) $$\tau \left( \omega \right) = \frac{{d\phi \left( \omega \right)}}{{d{\omega ^2}}}$$ C) $$\tau \left( \omega \right) = - \frac{{{d^2}\phi \left( \omega \right)}}{{d{\omega ^2}}}$$ D) $$\tau \left( \omega \right) = \frac{{{d^2}\phi \left( \omega \right)}}{{d\omega }}$$

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Answer: Option A

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Blue colour of sky look due to

A) Reflection B) Retraction C) Scattering D) Diffraction

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Answer: Option C

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A vector \[\overrightarrow P \] is given by \[\overrightarrow P = {x^3}y{\overrightarrow a _x} - {x^2}{y^2}{\overrightarrow a _y} - {x^2}yz{\overrightarrow a _z}\]
Which of the following statements is TRUE?

A) \[\overrightarrow P \] is solenoidal, but not irrotational B) \[\overrightarrow P \] is irrotational, but not solenoidal C) \[\overrightarrow P \] is neither solenoidal nor irrotational D) \[\overrightarrow P \] is both solenoidal and irrotational

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Answer: Option A

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The intensity of radiation of a dipole depends strongly on frequency. If at a frequency f, the intensity of radiation is '$$I$$' then at a frequency of $$\frac{{\text{f}}}{2}$$, the intensity will be:

A) $$\frac{{\text{I}}}{2}$$ B) $$\frac{{\text{I}}}{4}$$ C) $$\frac{{\text{I}}}{8}$$ D) $$\frac{{\text{I}}}{{16}}$$

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Answer: Option B

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A lossy transmission line has resistance per unit length-R = 0.01 Ω/m. The line is distortion less and has characteristic impedance of 100 Ω. The attenuation constant (in NP/m, correct to three decimal places) of the line is

A) 0.0001 B) 0.001 C) 0.01 D) 0.1

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Answer: Option A

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A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1 Ω/m. If the line is distortion less, the attenuation constant (in Np/m) is

A) 500 B) 5 C) 0.014 D) 0.002

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Answer: Option D

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