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171.

As compared to green sand in shell moulding cooling rate of cast metal is slow. Hence as compared to green sand castings, shell moulded castings will have

larger grain size

smaller grain size

172.

Shell moulding is uneconomical for

A.	small castings	B.	large scale production
C.	small scale production	D.	all of the above

173.

Malleable castings are used for

A.	boilers	B.	Automobiles
C.	Elevators	D.	all of the above

174.

Die casting dies are generally made of

A.	cast iron	B.	aluminium alloys
C.	alloy steels	D.	bronze

175.

Die casting is generally not used for

A.	zinc base alloys	B.	aluminium base alloys
C.	non-ferrous metals	D.	cast iron

176.

The function of ejection pin in die casting is to

A.	pushout casting off the die	B.	provide movable core spaces
C.	facilitate die casting of several components	D.	none of the above

177.

Flash occurs on diecastings at the

A.	parting surface of two dies	B.	vents between the dies
C.	ejection pins	D.	gatting system

178.

Hairlines in die casted materials result from

A.	chemical attack	B.	mechanical erosion
C.	thermal fatigue	D.	all of the above

179.

The melting unit is an integral part of

A.	the cold chamber diecastings machine	B.	the hot chamber die casting machine
C.	both (A) and (B) above

180.

Shaving of die casted parts is the process of removal of

A.	sprue	B.	flash
C.	runner	D.	none of the above