519. With H.S.S. tools, highest cutting speed is used while machining
A.Cast iron
B.Aluminium
C.Brass
D.Bronze

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520. In machining, chips break due to
A.Plasticity
B.Ductility
C.Toughness
D.Work hardening

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521. When machining a hard and brittle metal like cast iron, the type of chips produced is
A.Continuous chip
B.Discontinuous chip
C.Continuous chip with built-up edge
D.No chips are produced

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522. The following type of chip is produced when machining ductile materials
A.Continuous chip
B.Discontinuous chip
C.Continuous chip with built-up-edge
D.No chips are produced

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523. The advantage of positive rake angles on cutters is that these
A.Use less power
B.Have less cutting pressures
C.Work well on soft and ductile materials
D.All of the above

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524. The following cutting fluid is used with carbide tools
A.Kerosene oil
B.No cutting fluid
C.Water
D.Water with oil

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525. The sector arm in indexing head is so adjusted that the number of holes between the beveled edges is equal to
A.No. of holes to be indexed
B.No. of holes to be indexed + 1
C.No. of holes to be indexed -1
D.No. of holes to be indexed + 2

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