Electrical Engineering Materials Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Electrical Engineering Materials ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Electrical Engineering Materials comprehensively.

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91.
Which of the following factors affect resistivity of metals ?

Age hardening

Alloying

Temperature

Cold work

All of the above

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92.
Superconducting metal in super conducting state has relative permeability of________________?

Zero

One

Negative

More than one

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93.
For a particular material the Hall coefficient was found to be zero. The material is______________?

Insulator

Metal

Intrinsic semiconductor

None of the above

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94.
For a hole which of the following statements is incorrect ?

Holes can exist in certain semiconductors only

Holes can exist in any material including conductors

Holes may constitute an electric current

Holes can be considered as a net positive charge

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95.
The conductivity of an extrinsic semiconductor with temperature________________?

Decreases

Increases

Remains constant

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96.
The carbon percentage is least in__________________?

Low carbon steel

Wrought iron

Cast iron

Malleable iron

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97.
is an element used in semiconductors whose atoms have three valence electrons?

An acceptor

A donor

Germanium

Silicon

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98.
For germanium the forbidden energy gap is_______________?

0.15 eV

0.25 eV

0.5eV

0.7eV

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99.
The current due to electron flow in conduction band is the hole current in valence band?

Equal to

Less than

Greater than

Any of the above

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100.
The minority carrier concentration is largely a function of_____________?

Forward biasing voltage

Reverse biasing voltage

Temperature

The amount of doping

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