232. The longitudinal joint of drums of 150 mm thick sheets are made by
A.Electric arc
B.Plasma arc welding
C.Electro slag welding resistance welding
D.Laser beams

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233. Antioch process is a
A.Continuous casting process
B.Welding process
C.Process of making porous moulds
D.Brazing process

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234. In centrifugal casting, cores are made of
A.Steel
B.Hard sand
C.Plastic
D.None of the above

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235. Semi-centrifugal casting
A.Is used to ensure purity and density at extremities of a casting
B.Is used to cast symmetrical objects
C.Is used to obtain high density and pure castings
D.Uses heavy cast iron mould to act as chill

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236. For gray cast iron, the pattern shrinkage allowance is of the order of
A.2 to 5 mm/m
B.5 to 7 mm/m
C.7 to 10.5 mm/m
D.10.5 to 13.5 mm/m

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237. Surfaces to be machined are marked on the pattern by the following colour
A.Black
B.Yellow
C.Red
D.Blue

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238. Colour scheme is employed on patterns in order to identify the
A.Pattern allowances
B.Location of core print
C.Material of pattern
D.None of the above

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