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91.

Metal moulds are used in all of the following EXCEPT:

A.	Die casting process	B.	Investment casting
C.	Permanent mould casting	D.	Centrifugal casting

92.

In furan process, furan resins are primarily used as

A.	binders	B.	chemicals for exothermic reactions
C.	fluxes	D.	none of the above

93.

In furan moulding which of the following is used as a catalyst?

A.	Ammonium hydroxide	B.	Potassium hydroxide
C.	Phosphoric acid	D.	Phenol formaldehyde

94.

In investment casting the pattern is made of

A.	wood	B.	urea formaldehyde
C.	wax	D.	none of the above

95.

The advantage of investment casting is

A.	high degree of accuracy	B.	adaptability to casting of most of the metals
C.	complex shaped articles can be cast	D.	all of the above

96.

In case of plaster moulding the mould is prepared in

A.	gypsum plaster	B.	slacked lime
C.	lime + cement	D.	any of the above

97.

A drawback is employed when

A.	the pattern is too bulky	B.	the pattern is too long
C.	the pattern cannot be drawn from mould due to projection	D.	the pattern is not made of wood

98.

Blow holes in castings are due to

A.	high moisture content of the sand	B.	low permeability of sand
C.	excessive fine grains and gas producing ingredients	D.	any of the above

99.

The defect known as 'drop' occurs when the upper surface of the mould cracks and pieces of sand fall into the molten metal. This defect occurs due to

A.	low mould hardness	B.	insufficient reinforcement
C.	low green strength	D.	any of the above

100.

Scabs may be caused by

A.	low permeability of sand	B.	high moisture content of sand
C.	intermittent running of molten metal over the sand surface	D.	any of the above