Exercise: Materials And Components

Questions for: Materials And Components

A circular sphere mile is the area of cross-section of a wire
A:
having a diameter equal to 1 miles
B:
having a radius equal to 1 miles
C:
having a circumference equal to 1 miles
D:
none of the above
Answer: A
No answer description is available. Let's discuss.
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The iron core of a coil is removed so that it becomes an air cored coil. Its inductance will
A:
increase
B:
decrease
C:
remain the same
D:
may increase or decrease
Answer: B

Because magnetic flux will decrease.

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In a ferromagnetic material, the internal field seen by a dipole is
A:
equal to applied field
B:
equal to applied field minus a contribution from neighbouring dipoles
C:
equal to applied field plus a contribution from neighbouring dipoles
D:
equal to or less than applied field
Answer: C
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In its lowest state, the electron is bound to the field of proton by an energy equal to
A:
100.5 eV
B:
51.2 eV
C:
13.6 eV
D:
0.2 eV
Answer: C

13.6 eV is required to ionize hydrogen atom.

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High frequency inductors and capacitors are commonly plated with silver. The main purpose of this is to
A:
reduce dc resistance
B:
reduce ac resistance
C:
increase dc resistance
D:
increase ac resistance
Answer: B
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