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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 4
46.
The iron core of a coil is removed so that it becomes an air cored coil. Its inductance will
increase
decrease
remain the same
may increase or decrease
Answer: Option
Explanation:

Because magnetic flux will decrease.

47.
A circular sphere mile is the area of cross-section of a wire
having a diameter equal to 1 miles
having a radius equal to 1 miles
having a circumference equal to 1 miles
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
In an hydrogen atom, an electron moves in the field of a proton. The stability of orbit requires equilibrium between coulomb's force and centrifugal force.
True
False
Answer: Option
Explanation:

Orbit is stable only if the two forces are equal and opposite.

49.
For small size high frequency coils, the most common core material is
air
ferrite
powdered iron
steel
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
The orientation polarization of a polyatomic gas is inversely proportional to absolute temperature.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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