Which of these has lowest dielectric strength? - Materials and Components

Electronics and Communication Engineering (ECE) : Materials and Components - Quiz(MCQ)

Which of these has lowest dielectric strength?

A)

Paper

B)

Dry air

C)

Cotton

D)

Wet air

Correct Answer : Option (D) : Wet air

Explanation : Cotton and paper have higher dielectric strength than air. Moisture decreases dielectric strength.

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Magnetic hysteresis phenomenon is explained by

A)

domain rotation

B)

motion of domain walls

C)

motion of domain walls and domain rotation

D)

None of the above

Correct Answer : motion of domain walls and domain rotation

A circular sphere mile is the area of cross-section of a wire

A)

having a radius equal to 1 miles

B)

having a circumference equal to 1 miles

C)

having a circumference equal to 0 miles

D)

having a diameter equal to 1 miles

Correct Answer : having a diameter equal to 1 miles

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A)

steel

B)

ferrite

C)

air

D)

powdered iron

Correct Answer : air

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