Exercise: Materials And Components

Questions for: Materials And Components

If Bmax is the maximum flux density, eddy current loss is proportional to
A:
Bmax
B:
B1.6max
C:
B2max
D:
B3max
Answer: A
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Debye temperature of metals is
A:
about 10 K
B:
about 200 K
C:
about 600 K
D:
about 2 K
Answer: B
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Schrodinger wave equation is a
A:
linear equation
B:
differential equation
C:
partial differential equation
D:
none of the above
Answer: C
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In solid insulator materials having only one kind of atom, the types of polarization which exist are
A:
electronic only
B:
electronic and ionic
C:
electronic, ionic and permanent
D:
electronic and permanent
Answer: A

In elemental dielectrics only electronic polarization exists.

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For making a capacitor it is better to have a dielectric having
A:
high permittivity
B:
low permittivity
C:
permittivity same as that of air
D:
permittivity which is neither high nor low
Answer: A

Capacitance is directly proportional to permittivity.

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