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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 1
21.
Which element exhibits the property of inertia?
Resistance
Capacitance
Inductance
Both resistance and inductance
Answer: Option
Explanation:

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

22.
For a permanent magnetic material
the residual induction and coercive field should be large
the residual induction and coercive field should be small
area of hysteresis loop should be small
initial relative permeability should be high
Answer: Option
Explanation:

Materials suitable for permanent magnet have large hysteresis loop.

Hence residual and coercive field are large.

23.
In a coaxial cable, braided copper is used for
conductor
shield
dielectric
jacket
Answer: Option
Explanation:

Braided material is used for shield.

24.
The hysteresis phenomenon in ferromagnetic materials exists at all temperatures.
True
False
Answer: Option
Explanation:

Hysteresis phenomenon exists below ferromagnetic curie temperature.

25.

Assertion (A): Magnetic susceptibility of diamagnetic materials is much less than that of paramagnetic materials.

Reason (R): For diamagnetic as well as paramagnetic materials, μr is nearly equal to 1.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:

Magnetic susceptibility = (μr - 1)H.

For diamagnetic and paramagnetic materials magnetic susceptibility is very very small and μr = 1.

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