Exercise: Materials And Components

Questions for: Materials And Components

Lines of magnetic field attract each other.
A:
True
B:
False
C:
D:
Answer: B

Lines of magnetic field repel each other.

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Resistivity of copper is lower than that of nickel. When a small percentage of copper is added to nickel, the resistivity
A:
increases
B:
decreases
C:
may increase or decrease
D:
remains the same
Answer: A
No answer description is available. Let's discuss.
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In ferromagnetic materials, the orientation between neighbouring permanent dipoles is parallel.
A:
True
B:
False
C:
D:
Answer: A
No answer description is available. Let's discuss.
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A parallel plate capacitor having C = 200 x 10-12 F has loss dielectric having tan δ = 4 x 10-4. At an ac voltage of f = 106 Hz and peak value 2 V, the dielectric losses are
A:
10-8 W
B:
10-6 W
C:
10-4 W
D:
10-2 W
Answer: B

Dielectric losses = v2 ωC tan δ.

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As regards dielectric constant εr
A:
the units are farads/m
B:
the units are newton/coulomb
C:
it is dimensionless
D:
the units are farads
Answer: C

εr is only a number and does not have any units.

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