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ESE 2019 Technical (Materials Science : Quiz 4 )

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Question 1

Bauschinger effect is the phenomena where plastic deformation of metal

Question 2

In flame hardening, un-alloy steels is used with:

Question 3

When a ferromagnetic substance is magnetized, there are marginal diminiutions in its linear dimensions. This phenomenon is called

Question 4

Which among the following Paramagnetic materials become more magnetic on cooling?

Question 5

Intense magnetic field may be produced in a coil by using a

Question 6

Ferromagnetic materials show hysteresis in B-H characteristic. As the magnetic field is increased slowly from zero value, what is the first process which sets in the material to give net magnetization?

Question 7

A material shows spontaneous magnetization. This is due to
1) Weiss molecular field.
2) Cooperative effect among dipoles.
3) Cooperative effect among domains.
4) Absence of applied magnetic field.
Which of these statements are correct?

Question 8

In ionic crystals, electrical conductivity is

Question 9

The free electrons in a metal follow the kinetic theory of gases and the following statements are made about their properties:
1) The velocity of all the electrons is equal.
2) The electron have a velocity distribution ranging from zero to infinity.
3) The average velocity of electron gas is proportional to

(T = temperature).
4) The maximum velocity of electrons is proportional to T.
Which of these statements are correct?

Question 10

Ferrites are the materials which have

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ESE & GATE EC Material Science

Mar 5ESE & GATE EC