Engineering :: Metallurgy

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151.

Plasticisers are added to plastic compounds to

A.	Provide a protective layer	B.	Improve resistance to acids
C.	Improve resistance to alkalies	D.	Increase tensile strength
E.	Improve softness and flexibility

152.

The nature of atomic bond found in diamond is

A.	Ionic	B.	Covalent
C.	Metallic	D.	Either of above
E.	None of the above

153.

The crystal structure of most of the common metals is

A.	Hexagonal	B.	Cubic
C.	Orthorhombic	D.	Any of the above
E.	None of the above

154.

Monochromatic X-rays reflected from a calcite crystal (lattice constant ? = 3? ) give rise to first order Bragg reflection at 6.7?. The wavelength of these X-rays will be

A.	0.07 A	B.	0.7 A
C.	7A	D.	70 A
E.	170 A

155.

Magnetism is non-linearly related to the applied field in case of

A.	Diamagnetic field	B.	Paramagnetic field
C.	Ferromagnetic field	D.	All of the above
E.	None of the above

156.

The net magnetic moment is zero is case of

A.	Ferromagnetic materials	B.	Ferrimagnetic materials
C.	Anti-ferromagnetic materials	D.	All of the above
E.	None of the above

157.

All of the following are magnetic materials EXCEPT:

A.	Nickel	B.	Cobalt
C.	Iron	D.	Zinc
E.	Cast iron

158.

Nickel is

A.	Ferromagnetic	B.	Ferroelectric
C.	Dielectric	D.	Paramagnetic
E.	None of the above

159.

In a diamagnetic material the effect of an applied magnetic field is that

A.	A net dipole moment is induced in the material	B.	There is a net reduction in flux density
C.	The induced magnetism is in opposition to applied field	D.	All of the above
E.	None of the above

160.

Ferrites are a sub-group of

A.	Ferromagnetic materials	B.	Ferrimagnetic materials
C.	Diamagnetic materials	D.	Paramagnetic materials
E.	None of the above