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161.

Above the curie temperature, a magnetic material becomes

162.

In anti-ferromagnetic materials the spin moments associated with two sets of atoms are aligned

A.	Anti-parallel to each other	B.	Parallel to each other
C.	Random to each other	D.	Anti-parallel but of unequal magnitudes
E.	None of the above

163.

The electrical conductivity of ferrites is

A.	Less than that of ferromagnetic materials	B.	Equal to that of ferromagnetic materials
C.	Greater than that of ferromagnetic materials	D.	Very high as compared to that of ferromagnetic materials
E.	Very low as compared to that of ferromagnetic materials

164.

During dielectric heating, the heat is generated primarily due to

165.

High ductility wires are made on

166.

The correct order of cooling media for decreasing cooling rate is

A.	Air, water, oil, fused salt	B.	Water, air, fused salt, oil
C.	Oil, fused salt, air, water	D.	Water, oil, fused alst, air

167.

Which of the following material is used for permanent magnets?

168.

Which of the following materials are usually most ductile?

A.	Hexagonal close-packed lattice	B.	Face centred cubic lattice
C.	Body centred lattice	D.	Amorphous
E.	Non-metallic

169.

In nodular iron, graphite is present in the form of

170.

Which of the following is closest to the purest form of iron