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.

Recently Updated in Materials and Components Questions
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

For small size high frequency coils, the most common core material is
A)
steel
B)
ferrite
C)
air
D)
powdered iron

Correct Answer :   air

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