Engineering :: Foundry Technology

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101.

Rough surface of casting may result from

A.	high permeability of sand	B.	large grain size
C.	soft ramming	D.	any of the above

102.

Which of the following is core hardening process?

A.	CO2 process	B.	Cold set process
C.	Furan system	D.	All of the above

103.

Which of the following statement about core is incorrect?

A.	core should be permeable to escape of core gases	B.	core should be capable of collapsing shortly after the molten metal has solidified around it
C.	core should produce maximum amount of gas when in contact with molten metal	D.	core should be capable of collapsing after the molten metal has solidified around it

104.

Heating of core is necessary while using which of the following core binder?

A.	Phenol formaldehyde resin	B.	Phenolic alcohols
C.	Furan-base binder	D.	All of the above

105.

Chaplets are

A.	core binders	B.	core supports
C.	core projections	D.	mould seats to support core

106.

Chaplets are provided to

A.	reduce core sag	B.	support heavy cores
C.	compensate for inadequate coreseats	D.	all of the above

107.

Chaplets are made of

A.	core sand	B.	organic matter
C.	wood	D.	metal

108.

Tin coated low carbon steel chaplets are used in

A.	ferrous foundries	B.	non-ferrous foundries
C.	both (A) and (B) above

109.

Which of the following statement about gates is incorrect?

A.	he size of gate depends upon the rate of solidification	B.	A small gate is used for castings which solidify rapidly
C.	More than one gate may be used to feed a fast freezing casting	D.	A gate should not have sharp edges

110.

The cross-section of a sprue

A.	square	B.	circular
C.	rectangular	D.	any of the above