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181.

Swell is a defect in castings due to

A.	Mis-mathcing of mould at the parting line	B.	Working on cooling
C.	Enlargement of the mould cavity by metal pressure causing partial or overall enlargement of the casting	D.	Thin projection of casting due to gap between flasks
E.	Moisture in moulding sand

182.

Vertical centrifugal castings as compared to horizontal centrifugal castings are spun at

183.

Shot blasting is

A.	Process of cleaning moulding sand	B.	Process of cleaning core sand
C.	Process of supplying blast of hot air to cupola	D.	Process of cleaning castings
E.	Process of cleaning spherical objects only

184.

Sweep patterns are used for

185.

Draft allowance on castings is generally

186.

Permissible percentage of moisture in dry woods for pattern making is

187.

The purpose of using a core in moulding is

A.	To produce chilled surface	B.	To produce sound casting
C.	To provide desired recesses in casting	D.	To enable easy removal of pattern
E.	To permit uniform flow of metal during moulding

188.

Gold ornaments are generally produced by

189.

In a steel plant the product of a blast furnace is

190.

Brass is