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171.

A sprue is

A.	A tool used in mould repairing	B.	A process of cleaning castings
C.	A chemical added to molten materials to get sound castings	D.	A vertical passage through the cope and connecting the pouring basin to the runner or gate
E.	A special type of non-ferrous core used in centrifugal castings only

172.

A gate is the

A.	Passage through which metal is poured into the mould	B.	Passage through which metal rises when the mould is filled
C.	Passage that finally leads molten metal from the runner into the mould cavity	D.	Vent hole to allow for the hot gases to escape
E.	Channel for the flow of excess molten material

173.

The purpose of sometimes adding exothermic materials to sand is

A.	To heat the sand	B.	To heat the core
C.	To dry the mould	D.	To produce directional solidification by the generation of heat
E.	To produce chilled surfaces

174.

Fetling of castings is done to

A.	Smoothen surfaces	B.	Fill the void by welding
C.	Remove the extra material from castings	D.	To remove internal stresses from castings
E.	To produce uniformly cooled castings.

175.

Core prints are provided to

A.	Form trade mark of company on castings	B.	Produce castings with specific surface design
C.	Form seat to support and hold the core	D.	Direct the flow of molten material during pouring
E.	Reinforce the core to withstand the force of buoyancy of molten metal

176.

A 20 number crucible

A.	Will have capacity to melt 20 kg of copper	B.	Will have internal diameter of 20 cm
C.	Will have height of 20 cm	D.	Can take 20 cc of molten material
E.	Can produce castings of 20 kg only

177.

The fuel used in pit furnace is generally

178.

Slag inclusion in castings is a

A.	Superficial defect	B.	Internal defect
C.	Moulding defect	D.	Defect that can be removed by felting
E.	Surface defect

179.

The equipment used in pit for supply of air is

A.	Fan	B.	Hand blower
C.	Reciprocating air compressor	D.	Air cylinder
E.	Centrifugal blower

180.

In a cupola the raw material is