Engineering :: Foundry Technology

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61.

Oil used for core sand is

A.	molasses	B.	linseed oil
C.	mineral oil	D.	any of the above

62.

The principal ingredients of moulding sands are

A.	silica sand, carbon and water	B.	silica sand, clay and water
C.	silica sand, dust and crabon	D.	silica sand, carbon, hydrocarbons and moisture

63.

Which of the following sand must possess high refractoriness?

A.	Backing sand	B.	Parting sand
C.	Facing sand	D.	all of the above

64.

Clay used for foundry sand should be

A.	kaolinite	B.	montmorillonite
C.	illite	D.	any of the above

65.

Which grain shape of sand particles is least preferred for foundry sands?

A.	Round	B.	angular
C.	Compound

66.

Which of the following is used on moulds for magnesium castings to prevent metal mould reactions?

A.	Boric sulphur	B.	Molasses
C.	Charcoal	D.	all of the above

67.

Which of the following is used to obtain fine surface finish in ferrous castings?

A.	Ground pitch	B.	Sea coal
C.	Gilsonite	D.	any of the above

68.

The burnt on sand causes difficulty in

A.	machining of castings	B.	removal of castings from moulds
C.	separation of sand and castings after pouring	D.	all of the above

69.

Which of the following is the anti-penetration material introduced in the moulding sand?

A.	Coad dust	B.	Powdered quartz
C.	Black oil	D.	all of the above

70.

The amount of coal dust added to moulding sand depends on

A.	shape of the casting	B.	thickness of the casting
C.	temperature of pouring	D.	none of the above