274. In full annealing process, the hypoeutectoid steel is
A.Heated above A3 line and cooled very slowly in furnace as to refine old structure
B.Heated below A1 line with a view to make steel ductile for cold working
C.Heated below A1 line and cooled slowly with a view to remove internal stresses
D.Heated above A3 line and cooled in air resulting in slight hardening

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275. Machinability of a metal depends on
A.Hardness
B.Tensile strength
C.Brittleness
D.Both (A) and (B) above

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276. Pick up wrong property of austenite
A.Softness
B.Malleability
C.Magnetism
D.Ductility

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277. In process annealing process, the hypoeutectoid steel is
A.Heated above A3 line and cooled very slowly in furnace so as to refine old structure
B.Heated below A1 line with a view to make steel ductile for bold working
C.Heated below A1 line and cooled slowly with a view to remove internal stresses
D.Heated above A3 line and cooled in air resulting in slight hardening

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278. The imperfection in the crystal structure of metal is called
A.Dislocation
B.Slip
C.Fracture
D.Impurity

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279. Thermosetting plastics
A.Soften on the application of heat and can be repeatedly moulded
B.Will not deform when again subjected to heat
C.Are produced on a synthetic resin base
D.Are synthetic base resins having a predefined setting temperature

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280. Other than elasticity and rubber like material, the important property of polyvinyl chloride (PVC) is
A.Odourless
B.Colourability
C.Non-flammable
D.Impervious to water

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