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Engineering-materials Questions Set 17:

Quiz Mode

Normalized steel has lower

yield point

tensile strength

impact strength

Machinability

Solution:

The Widmanstätten structure is encountered in

Tempering

Normalizing

Spheroidizing

Annealing

Solution:

What is the result of full annealing of hypoeutectoid steels?

Cementite

Bainite

Coarse pearlite

Silicon

Solution:

What is the pearlite phase in an iron-carbide phase diagram?

eutectic phase

hypoeutectic mixture

eutectoidal mixture

hypereutectic phase

Solution:

A measure of Rockwell hardness is the

depth of penetration of indenter

surface area of indentation

projected area of indentation

height of rebound

Solution:

Cermets are

ceramics with metallic strength and lustre

coated tool materials

metal-ceramic composites

metals for high temperature use with ceramic-like properties

Solution:

What is the difference between the angle of Burgers vector and dislocation line in edge dislocation and screw dislocation?

-90 degrees

0 degrees

45 degrees

90 degrees

Solution:

A free bar of length L is uniformly heated from 0°C to a temperature t°C. If α is the coefficient of linear expansion and E is the modulus of elasticity, the stress in the bar is:

αtE

αtE/2

Zero

None of the above

Solution:

What is the primary effect of recrystallization?

Produces new structure as well as new grains

Produces new grains only, not a new structure

Produces new structure only, not new grains

Does not produce new grains or new structure

Solution:

Interstitial diffusion is generally faster than diffusion by vacancy mode. This is because:

Vacancy diffusion requires more energy than interstitial diffusion

Interstitial species are smaller than substitution species

The number of interstitial sites is greater than the number of vacancies

All of the above

Engineering-materials Questions Set 17:

Normalized steel has lower

Solution:

The Widmanstätten structure is encountered in

Solution:

What is the result of full annealing of hypoeutectoid steels?

Solution:

What is the pearlite phase in an iron-carbide phase diagram?

Solution:

A measure of Rockwell hardness is the

Solution:

Cermets are

Solution:

What is the difference between the angle of Burgers vector and dislocation line in edge dislocation and screw dislocation?

Solution:

A free bar of length L is uniformly heated from 0°C to a temperature t°C. If α is the coefficient of linear expansion and E is the modulus of elasticity, the stress in the bar is:

Solution:

What is the primary effect of recrystallization?

Solution:

Interstitial diffusion is generally faster than diffusion by vacancy mode. This is because:

Solution:

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