Exercise: Materials And Components

Questions for: Materials And Components

When temperature is more than ferromagnetic curie temperature, the behaviour of a ferromagnetic material is similar to that of paramagnetic material.
A:
True
B:
False
C:
D:
Answer: A
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Assertion (A): ∈0 has the dimensions of farad per meter.

Reason (R): D = ∈0∈r E.

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: B

The dimensions of ∈0 can be derived from the expression D = ∈0∈r E.

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The number of valence electrons in germanium atom is
A:
4
B:
2
C:
1
D:
zero
Answer: A
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Resistivity of metals consists of two parts, one part constant and the other temperature dependent.
A:
True
B:
False
C:
D:
Answer: A
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The maximum temperature limit of class B insulation is
A:
90°C
B:
105°C
C:
120°C
D:
130°C
Answer: D
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