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161.

In hot blast cupola

A.	Temperature is high	B.	Melting rate is high
C.	Carbon percentage in castings is high	D.	Air supplied is preheated
E.	None of the above

162.

In a cupola

A.	Tape hole is below wind box	B.	Tape hole is above wind box
C.	Slag spout is above wind box	D.	Slag spout is below tape hole
E.	Wind box and tap hole are at the same level

163.

Investment casting uses pattern made of

164.

The main advantage of investment casting is

A.	Raw materials required are cheap	B.	No special tooling is required
C.	There is no sophisticated technology involved	D.	High degree of accuracy and surface finish
E.	It can be conveniently adopted for heavy castings

165.

In die casting process

A.	Any metal can be cast	B.	Any size of casting can be prepared
C.	The cost of dies is generally insignificant	D.	Very high production rates are possible
E.	Dimensional accuracy is immaterial

166.

A third flask sometimes used between cope and drag is called

167.

In sand moulding the bottom flask is called

168.

The disadvantage of die casting process is

A.	High production rates are not possible	B.	Surface finish is poor
C.	Heavy section can be easily cast	D.	Cost is less
E.	Only certain non-ferrous alloys can be cast economically

169.

Cast iron pipes are cast by

A.	Loam moulding process	B.	Die casting process
C.	Centrifugal casting process	D.	Investment casting process
E.	Vacuum moulding process

170.

True centrifugal casting is used to

A.	Cast objects symmetrical about an axis	B.	Get accurate castings
C.	Get dynamically balanced castings	D.	Get statistically balanced castings
E.	Get chilled castings