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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 9
11.
As regards dielectric constant εr
the units are farads/m
the units are newton/coulomb
it is dimensionless
the units are farads
Answer: Option
Explanation:

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

12.
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
10-8 W
10-6 W
10-4 W
10-2 W
Answer: Option
Explanation:

Dielectric losses = v2 ωC tan δ.

13.
In ferromagnetic materials, the orientation between neighbouring permanent dipoles is parallel.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
Resistivity of copper is lower than that of nickel. When a small percentage of copper is added to nickel, the resistivity
increases
decreases
may increase or decrease
remains the same
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Lines of magnetic field attract each other.
True
False
Answer: Option
Explanation:

Lines of magnetic field repel each other.

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