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
275. Machinability of a metal depends on
A.Hardness
B.Tensile strength
C.Brittleness
D.Both (A) and (B) above
276. Pick up wrong property of austenite
A.Softness
B.Malleability
C.Magnetism
D.Ductility
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
278. The imperfection in the crystal structure of metal is called
A.Dislocation
B.Slip
C.Fracture
D.Impurity
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
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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