Engineering :: Foundry Technology

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161.

Magnesium aluminium alloys are grain refined by addition of

A.	sulphur	B.	manganese
C.	carbon	D.	tin

162.

For grey cast iron the pouring temperature is

A.	1510 to 1532?C	B.	1455 to 1495?C
C.	1400 to 1465?C	D.	1250 to 1290?C

163.

In case of copper, the pouring temperature is around

A.	1450?C	B.	1260?C
C.	1160?C	D.	1060?C

164.

Lowest pouring temperature alloy is

A.	Tin bronze	B.	Phosphor bronze
C.	Monel metal	D.	Cupro nickel alloy

165.

For aluminium alloys grain refinement can be achieved using

A.	titanium	B.	boron
C.	zirconium	D.	any of the above

166.

Which of the following process is used for melting of steel?

A.	L D process	B.	Kaldo process
C.	Duplex process	D.	All of the above

167.

In case of arc furnaces electric supply for electrodes consists of

A.	low voltage and high current	B.	high voltage and high current
C.	high voltage and low current	D.	low voltage and low current

168.

Composition of cast iron can be better controlled when melted in

A.	pit furnace	B.	cupola
C.	arc furnace	D.	none of the above

169.

Which parameter can be used for the measurement of melt in a foundry?

A.	Thermo couple pyrometer	B.	Optical pyrometer
C.	Radiation pyrometer	D.	none of the above

170.

Shell moulding can be used for

A.	producing thin castings	B.	better surface finish
C.	tolerances of the order of 0.002 mm per mm	D.	all of the above