Exercise: Materials And Components

Questions for: Materials And Components

A good dielectric should have
A:
low losses
B:
good heat conductivity
C:
high intrinsic strength
D:
all of the above
Answer: D
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The dipole moment per unit volume P as a function of E for an insulator is
A:
P = ∈0 E(∈r)
B:
P = ∈0 E
C:
P = ∈0(∈r - 1) E
D:
P =
Answer: C
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Eddy current loss is
A:
proportional to frequency
B:
independent of frequency
C:
proportional to (frequency)2
D:
proportional to (frequency)3
Answer: C
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Assertion (A): Relative permittivity is determined by the atomic structure of the material.

Reason (R): Absolute permittivity is determined by the atomic structure of the material.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not correct explanation of A
C:
A is true but R is false
D:
A is false but R is true
Answer: C
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The current flow in a semiconductor is due to
A:
holes
B:
electrons
C:
holes and electrons
D:
holes, electrons and ions
Answer: C
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