295. The effect of alloying zinc to copper is
A.To raise hardness
B.To impart free-machining properties
C.To improve hardness and strength
D.To increase strength and ductility (if added upto 10-30%)

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296. Which of the following is better suited for lighter duty bearings
A.White metal
B.Phosphor bronze
C.Monel metal
D.Neimonic alloys

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297. Which of the following is better suited for heavier duty bearings
A.White metal
B.Phosphor bronze
C.Monel metal
D.Neimonic alloys

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298. The effect of alloying nickel to copper is
A.To raise hardness
B.To impart free-machining properties
C.To improve hardness and strength
D.To increase strength and ductility (if added upto 10-30%)

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299. The effect of alloying lead to copper is
A.To raise hardness
B.To impart free-machining properties
C.To improve hardness and strength
D.To increase strength and ductility (if added upto 10-30%)

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300. The grain structure obtained by isothermal hardening operation is
A.Martensite
B.Acicular troostite
C.Bainite
D.Tropstite

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301. In order to prevent excessive scaling of parts being hardened in heating furnace, following should be properly controlled.
A.Atmosphere
B.Temperature
C.Fuel
D.Air-fuel ratio

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