Engineering :: Foundry Technology

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261.

A casting process which can produce hollow cylinder without use of core is

A.	permanent mould casting	B.	semi permanent mould casting
C.	pressed casting	D.	none of the above

262.

In low temperature die casting the metals whose alloys are cast are

A.	aluminium and zinc	B.	zinc and copper
C.	copper, zinc and lead	D.	none of the above

263.

A mould cracks after drying. It indicates

A.	excess of clay	B.	lack of clay
C.	coarse irregular grains	D.	none of the above

264.

The function of riser is

A.	to provide an opening through which molten metal is poured	B.	to give an indication that mould is filled
C.	to allow the heat of molten metal to dissipate to atmosphere	D.	to supply molten metal to casting as it tends to contract during solidification

265.

For producing several similar parts from a single mould the moulding used is

A.	bench moulding	B.	floor moulding
C.	plate moulding	D.	none of the above

266.

The residual stresses in casting occur due to

A.	sand particles being taken into molten metal while pouring	B.	the insufficient gate size
C.	the differential solidification rate of thin and thick sections of casting	D.	none of the above

267.

The methods of casting for producing ornamental pieces are

A.	pressed and slush casting	B.	slush and gravity casting
C.	gravity and semi permanent mould casting	D.	none of the above