Engineering :: Foundry Technology

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181.

Chemical dipping of die casted parts is usually done for

A.	flash removal	B.	dimensional stability
C.	corrosion protection	D.	none of the above

182.

In die castings, heavy local sections are usually avoided and replaced by

A.	channel sections	B.	corrugated forms
C.	ribs	D.	any of the above

183.

The order of dimensional accuracy in die casting is nearly

A.	0.004 percent	B.	0.04 percent
C.	0.4 percent	D.	4 percent

184.

The order of surface finish possible in die castings is

A.	0.0008 microns	B.	0.008 microns
C.	0.08 microns	D.	0.8 microns

185.

When external features of the castings are important, which of the following method of casting is preferred?

A.	Die casting	B.	Dry sand casting
C.	Slush casting	D.	Carbondioxide casting

186.

In case of carbondioxide moulding, the binder used is generally

A.	sodium silicate	B.	china clay
C.	coal dust	D.	graphite

187.

In carbondioxide moulding the pressure of carbondioxide is around

A.	1.5 kg/cm2	B.	15 kg/cm2
C.	150 kg/cm2	D.	500 kg/cm2

188.

Carbondioxide moulding is useful for

A.	very thin sections	B.	regular sections
C.	heavy and thick walled sections	D.	all of the above

189.

Pneumatic tools find application in foundries normally for

A.	fin removal	B.	surface finish
C.	filling of cavities	D.	none of the above

190.

All of the following operations on castings are carried out for surface appearance improvement EXCEPT:

A.	Enamelling	B.	Electroplating
C.	Galvanising	D.	Chilling