Exercise: Materials And Components

Questions for: Materials And Components

Which of these has the highest dielectric strength?
A:
Mica
B:
Air
C:
Cotton
D:
Rubber
Answer: A
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A dielectric of relative permittivity ∈r is subjected to a homogeneous electric field E. The dipole moment P per unit volume is given by
A:
P = constant
B:
P = ∈0 E
C:
P = ∈0(∈r - 1) E
D:
P = ∈r E
Answer: C
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The colour code on a carbon resistor is yellow-violet-orange. The value of resistance is
A:
17000 Ω
B:
27000 Ω
C:
37000 Ω
D:
47000 Ω
Answer: D
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A single layer air cored coil has n turns and inductance L. If a new coil is formed by having 2n turns while keeping the coil length and diameter the same, the new inductance is
A:
0.5 L
B:
L
C:
2 L
D:
4 L
Answer: D

Inductance is proportional to square of number of turns.

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Assertion (A): In liquids and glassy substances, dielectric losses occur.

Reason (R): The orientation polarization in many substances is frequency dependent.

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: A
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