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-4

The wavelength of the wave having propagation constant (0.314 + j0.628) per metre is equal to:

A) 5 metres B) 20 metres C) 30 metres D) 10 metres

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Answer & Solution

Answer: Option D

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Many circles are drawn in a Smith chart used for transmission line calculations. The circles shown in the figure represent
Electromagnetic Field Theory mcq question image

Electromagnetic Field Theory mcq question image

A) unit circles B) constant resistance circles C) constant reactance circles D) constant reflection coefficient circles

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Answer: Option B

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Find the SWR, if the reflection coefficient is 0.8.

A) 9 B) 5 C) 4.5 D) 18

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Answer: Option A

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A dual directional coupler is connected in a microwave reflectometer measurement setup. The reading of the power meter in the forward direction is 100 mw and in the reverse direction 4 mw. The VSWR is

A) 4 B) 0.4 C) 1.5 D) 10

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Answer: Option C

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The characteristics impedance of quarter wave transformer with load and input impedances given by 30 and 75 respectively is-

A) 47.43 B) 37.34 C) 73.23 D) 67.45

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Answer: Option A

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If $$\overrightarrow E = \left( {{{\hat a}_x} + j{{\hat a}_y}} \right){e^{ikz - j\omega t}}$$ and $$\overrightarrow H = \left( {\frac{k}{{\omega \mu }}} \right)\left( {{{\hat a}_y} + j{{\hat a}_x}} \right){e^{ikz - j\omega t}},$$ the time averaged poynting vector is

A) null vector B) $$\left( {\frac{k}{{\omega \mu }}} \right){{\hat a}_z}$$ C) $$\left( {\frac{{2k}}{{\omega \mu }}} \right){{\hat a}_z}$$ D) $$\left( {\frac{k}{{2\omega \mu }}} \right){{\hat a}_z}$$

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Answer: Option A

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For distortion less transmission through a channel, the channel should be such that

A) its attenuation response is an even function and phase response is an odd function of frequency B) its attenuation response is flat and phase response is linear with frequency C) the ratio of line inductance to line capacitance is constant D) its termination is by a matched impedance

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Answer: Option B

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An electromagnetic wave propagates through a lossless insulator with a velocity 1.5 × 10¹⁰ cm/s. Calculate the electric and magnetic properties of the insulator if its intrinsic impedance is 90 π ohms.

A) ε_r = 2.66 µ_r = 1.5 B) ε_r = 1.5 µ_r = 2.66 C) ε_r = 1.2 µ_r = 2.0 D) ε_r = 2.0 µ_r = 1.2

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Answer: Option A

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For a lossless transmission line L = 0.35 µH/m. C = 90 pF/m and frequency = 500 MHz. Then the magnitude of 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 gradient of the function f(x, y) = x + y at the point (0, 0) is

A) 0 B) i + j C) 1 D) i + 2j

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Answer: Option B

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