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%)
296. Which of the following is better suited for lighter duty bearings
A.White metal
B.Phosphor bronze
C.Monel metal
D.Neimonic alloys
297. Which of the following is better suited for heavier duty bearings
A.White metal
B.Phosphor bronze
C.Monel metal
D.Neimonic alloys
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%)
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%)
300. The grain structure obtained by isothermal hardening operation is
A.Martensite
B.Acicular troostite
C.Bainite
D.Tropstite
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
Page 43 of 54