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-3 section-1

The critical frequency of ‘F’ layer is greater than 30 MHz.

A) True B) False

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Answer & Solution

Answer: Option B

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Which of the following statement regarding waveguides is incorrect?

A) At waveguide can be coupled to a coaxial cable B) At frequencies below the cut off value the wave progresses across the waveguide after total reflections C) Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves D) Waveguides can handle large power at UHF and microwaves

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Answer & Solution

Answer: Option A

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A rectangular waveguide is a

A) Rectangular conducting wire to propagate electromagnetic waves B) Hollow rectangular walled room carrying electromagnetic wave C) Hollow rectangular conducting tube through which electromagnetic waves can be propagat-ed D) Tube antenna to transmit and receive electromagnetic waves

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Answer & Solution

Answer: Option C

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Tropospheric scatter is used with frequencies in the

A) HF B) VHF C) UHF D) VLF

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Answer & Solution

Answer: Option C

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A Yagi antenna has a driven antenna

A) Only B) With a reflector C) With one or more directors D) With a reflector and one or more directors

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Answer & Solution

Answer: Option D

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In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

A) Transmission efficiency B) Front to back ratio C) Loss coefficient D) None of the above

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Answer & Solution

Answer: Option B

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The frequency range for satellite communication is

A) 3 to 30 kHz B) 300 to 3000 kHz C) 3000 to 30000 MHz D) 30000 to 300000 MHz

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Answer & Solution

Answer: Option C

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The static electric field in a conductor is

A) Zero B) Unity C) Infinity D) None of the above

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Answer & Solution

Answer: Option A

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The skip distance is the maximum distance upto which ionospheric reflection is possible.

A) True B) False

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Answer & Solution

Answer: Option B

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Parabolic and lens antenna used at

A) Microwave frequency B) Medium frequency C) Low frequency D) High frequency

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Answer & Solution

Answer: Option A

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