260. Pick up incorrect statement about advantages of vacuum die casting
A.It produces good quality castings
B.Porosity is reduced
C.Surface finish is improved
D.Less metal is used

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261. Ornaments are cast by
A.Die-casting
B.Continuous casting
C.Pressed casting
D.Centrifugal casting

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262. Ornamental objects, statues, toys etc. are cast by
A.Die casting
B.Pressed casting
C.Centrifugal casting
D.Slush casting

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263. Steel and cast iron pipes are cast by
A.Die casting
B.Continuous casting
C.True centrifugal casting
D.Centrifuging

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264. Scabs or buckles are the casting defects
A.Which occur due to some sand shearing from the cope
B.Which take the form of internal voids or Surface depression due to excessive gaseous material not able to escape
C.Which occur due to discontinuity in metal casting resulting from hindered contraction
D.Caused by two streams of metals that are too cold to fuse property

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265. In centrifugal casting, the impurities are
A.Uniformly distributed
B.Collected in the centre of casting
C.Forced outside the surface
D.Present in the middle section of casting

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266. The core in the centrifugal casting is made of
A.Carbon steel
B.Plastic
C.Abrasive material
D.No core is used

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