267. Hyperecutetoid steels have structure of
A.Pearlite alone
B.Phases of ferrite and pearlite
C.Phases of cementite and pearlite
D.Phases of ferrite and cementite

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268. The temperature and carbon content at which eutectic reaction occurs in Fe-C equilibrium diagram are
A.723°C and 0.02%C
B.723°C and 0.80%C
C.910°C and 4.30%C
D.1130°C and 2.00%C

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269. The temperature at which new grains are formed in a metal is called
A.Recrystallisation temprature
B.Lower critical temperature
C.Upper critical temperature
D.Eutectitc temperature

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270. The temperature and carbon content at which eutectoid reaction occurs in Fe-C equilibrium diagram are
A.723°C and 0.02%C
B.723°C and 0.80%C
C.1130°C and 2.00%C
D.1130°C and 4.30%C

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271. Steel is made from cast iron by removing
A.Ferrous carbide
B.Carbon
C.Tungsten
D.Sulphur

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272. The most important element which controls the physical properties of steel is
A.Silicon
B.Manganese
C.Tungsten
D.Carbon

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273. Large amounts of silicon when added to steel will increase the following properties of the steel
A.Mechanical
B.Refractory
C.Corrosive
D.Magnetic

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