Electrical Engineering Materials MCQ Questions & Answers | Electrical Engineering Page-4 section-1

31.
__________ is the main constituent of glass.

A. Fe₂O₃

B. SiO₂

C. AI₂O₃

D. B₂O₃

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32.
In a superconductor the value of critical density depends upon

A. Magnetic field strength

B. Temperature

C. Either A or B

D. Both A and B

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33.
The co-ordination number of a simple cubic structure is

A. 0

B. 2

C. 4

D. 6

E. 8

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34.
The conduction of electricity, in semiconductors, takes place due to movement of

A. Positive ions only

B. Negative ions only

C. Positive and negative ions

D. Electrons and holes

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35.
In conductors conduction of electricity takes place due to movement of

A. Electrons only

B. Positive ions only

C. Negative ions only

D. Positive and negative ions

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36.
A highly conductive material must have

A. Highest conductivity

B. Lowest temperature co-efficient

C. Good mechanical strength

D. Good corrosion resistance

E. All of the above

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37.
Is an element used in semiconductors whose atoms have three valence electrons.

A. An acceptor

B. A donor

C. Germanium

D. Silicon

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38.
The coils of D.C. motor starter are wound with wire of

A. Copper

B. Kanthal

C. Manganin

D. Nichrome

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39.
Due to which of the following factors the brush wear rate is altered?

A. Speed of the machine

B. Contact pressure

C. Surface conditions of brush and commutator

D. All of the above

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40.
Which of the following affect greatly the resistivity of electrical conductors?

A. Composition

B. Pressure

C. Size

D. Temperature

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Electrical Engineering Materials MCQ Questions & Answers | Electrical Engineering

31. __________ is the main constituent of glass.

Answer & Solution

32. In a superconductor the value of critical density depends upon

Answer & Solution

33. The co-ordination number of a simple cubic structure is

Answer & Solution

34. The conduction of electricity, in semiconductors, takes place due to movement of

Answer & Solution

35. In conductors conduction of electricity takes place due to movement of

Answer & Solution

36. A highly conductive material must have

Answer & Solution

37. Is an element used in semiconductors whose atoms have three valence electrons.

Answer & Solution

38. The coils of D.C. motor starter are wound with wire of

Answer & Solution

39. Due to which of the following factors the brush wear rate is altered?

Answer & Solution

40. Which of the following affect greatly the resistivity of electrical conductors?

Answer & Solution

31.
__________ is the main constituent of glass.

32.
In a superconductor the value of critical density depends upon

33.
The co-ordination number of a simple cubic structure is

34.
The conduction of electricity, in semiconductors, takes place due to movement of

35.
In conductors conduction of electricity takes place due to movement of

36.
A highly conductive material must have

37.
Is an element used in semiconductors whose atoms have three valence electrons.

38.
The coils of D.C. motor starter are wound with wire of

39.
Due to which of the following factors the brush wear rate is altered?

40.
Which of the following affect greatly the resistivity of electrical conductors?