Electrical Engineering Materials

This is an MCQ-based quiz on Electrical Engineering Materials.

This includes Insulators, Conductors, Semiconductors, and Superconductors.

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At transition temperature the value of critical field is

zero negative real value positive real value complex value

Carbon bearings are used under which of the following conditions?

Where lubrication is difficult or im-possible Where corrosive chemical action exists Where high temperature exists All of the above

_______ is viscoelastic.

Cast iron Graphite Rubber Glass

Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron.

Increases Decreases Does not change None of the above

Which of the following materials is preferred for transmitting electrical energy over long distance?

Copper Aluminium Steel reinforced copper Steel reinforced aluminium

In a crystal, an atom vibrates at a frequency determined by

The heat content of the crystal The temperature of the crystal The stiffness of the bonds it makes with neighbours None of the above

Steel wire is used as

Overhead telephone wire Earth wire Core wire of ACSR All of the above

Selenium is ________ semiconductor.

Extrinsic Intrinsic N-type P-type

For germanium the forbidden energy gap is

0.15 eV 0.25 eV 0.5 eV 0.7 eV

Effect of moisture on the insulating materials is to

Decrease dielectric constant Decrease dielectric strength Decrease insulation resistance All of the above

Low resistivity materials are used in

Transformer, motor and generator windings Transmission and distribution lines House wiring All above applications

Most of the common metals have _________ structure.

Linear Hexagonal Orthorhombic Cubic

An H.R.C. fuse is

A ceramic body having metal and caps

A wire of platinum

A heavy cross-section of copper or aluminium

A ceramic tube having carbon rod inside it

By increasing impurity content in the metal alloy the residual resistivity always

Decreases

Increases

Remains constant

Becomes temperature independent

The minority carrier concentration is largely a function of

Forward biasing voltage

Reverse biasing voltage

Temperature

The amount of doping

Carbon electrodes are not used in

GLS lamps

Electric arc furnace

Dry cells

Cinema projectors

The metal having the lowest temperature coefficient of resistance is

Gold

Copper

Aluminium

Kanthal

The photo-electric effect occurs only when the incident light has more than a certain critical

Intensity

Speed

Frequency

Wave length

The resistivity of a metal is a function of temperature because

The amplitude of vibration of the atoms varies with temperature

The electron density varies with temperature

The electron gas density varies with temperature

Any of the above

The structure sensitive property of a super conductor is

Critical magnetic field

Transition temperature

Critical current density

None of the above

Quiz/Test Summary

Title: Electrical Engineering Materials

Questions: 20

Contributed by:

Diego Fri, Apr 01, 2022 07:58 AM UTC

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