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201.

Heat treatment of castings is usually done for

A.	refinement of grain structure	B.	improving machinability
C.	relieving internal stress	D.	any of the above

202.

Tempering is generally done to reduce all of the following EXCEPT:

A.	Brittleness	B.	Ductility
C.	Hardness	D.	Tensile strength

203.

For stress relieving, castings are

A.	heated to low temperature and furnace cooled	B.	heated by flame and air cooled
C.	heated to a temperature around melting point and slowly cooled	D.	heated in stages and also cooled in stages

204.

Local stress relief treatments are generally given to

A.	non-ferrous castings	B.	small castings
C.	too large castings	D.	all castings

205.

Which heat treatment is applicable to aluminium alloy castings?

A.	Stabilizing	B.	Solution heat treatment
C.	Artificial ageing	D.	all of the above

206.

For annealing of aluminium it is heated to

A.	325?C	B.	425?C
C.	525?C	D.	625?C

207.

Annealing of aluminium castings

A.	reduces tensile strength	B.	improves ductility
C.	relieves micro stresses	D.	mechanical properties change

208.

The percentage of sulphur in pig iron is generally

A.	0.01% to 0.3%	B.	0.3% to 0.55%
C.	0.6% to 0.79%	D.	0.8% to 0.9%

209.

Pure iron melts at 1500?C. Presence of carbon

A.	reduces the melting point	B.	increases the melting point
C.	does not change the melting point

210.

Presence of sulphur in cast iron

A.	retards fluidity	B.	promotes brittleness
C.	promotes oxidation	D.	all of the above