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Electrical Engineering Materials MCQ Questions & Answers | Electrical Engineering

Learn Electrical Engineering Materials MCQ questions & answers are available for a Electrical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Electrical Engineering Materials MCQ question is the important chapter for a Electrical Engineering and GATE students. Page-5 section-1

41
Carbon resistors are used extensively because they are
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Answer & Solution
Answer: Option D
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42
The current due to electron flow in conduction band is the hole current in valence band.
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Answer: Option C
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43
The metal having the lowest temperature coefficient of resistance is
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Answer: Option A
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44
A perfect conductor has
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Answer: Option C
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45
For a particular material the Hall coefficient was found to be zero. The material is
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Answer: Option B
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46
Total number of crystal systems is
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Answer: Option C
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47
Superconductors are becoming popular for use in
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Answer & Solution
Answer: Option A
Solution:
Superconductors are materials that exhibit zero electrical resistance and expel magnetic fields below a certain critical temperature.

Strong magnetic fields are generated in applications like MRI machines, particle accelerators, and fusion reactors by using superconducting coils.

These coils can carry extremely high currents without any energy loss due to their superconducting properties, enabling the generation of very strong magnetic fields.

Other options like generating electrostatic fields or regions free from magnetic fields are not related to the primary applications of superconductors.

Therefore, Option A is the correct answer.
48
In graphite, bonding is
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Answer: Option D
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49
The converse of hardness is known as
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Answer: Option C
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50
Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
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Answer & Solution
Answer: Option B
Solution:
Temperature coefficient of resistance (TCR) indicates how much the resistance of a material changes with temperature.

A material with a low temperature coefficient shows very little change in resistance when temperature varies, which is desirable for precision resistors and measuring instruments.

Constantan has an extremely low and nearly zero temperature coefficient of resistance compared to other resistive materials listed.

Nichrome and Kanthal have higher temperature coefficients and are mainly used for heating elements where resistance change is acceptable.

Molybdenum is a metal with a relatively high positive temperature coefficient of resistance.

Therefore, the resistive material with the lowest temperature coefficient of resistance is Constantan.