Exercise: Materials And Components

Questions for: Materials And Components

The hysteresis phenomenon in ferromagnetic materials exists at all temperatures.
A:
True
B:
False
C:
D:
Answer: B

Hysteresis phenomenon exists below ferromagnetic curie temperature.

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In a coaxial cable, braided copper is used for
A:
conductor
B:
shield
C:
dielectric
D:
jacket
Answer: B

Braided material is used for shield.

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For a permanent magnetic material
A:
the residual induction and coercive field should be large
B:
the residual induction and coercive field should be small
C:
area of hysteresis loop should be small
D:
initial relative permeability should be high
Answer: A

Materials suitable for permanent magnet have large hysteresis loop.

Hence residual and coercive field are large.

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Which element exhibits the property of inertia?
A:
Resistance
B:
Capacitance
C:
Inductance
D:
Both resistance and inductance
Answer: C

Inductance opposes rise and decay of current. Hence it has the property of inertia.

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When an electric field E is applied to solid and liquid insulating materials, the internal field Ei acting at the location of atom is such that
A:
Ei = E
B:
Ei > E
C:
Ei < E
D:
Ei may be equal to or less than E
Answer: B

The actual field seen by an atom is larger than applied field.

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