Category: Engineering Materials

A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85-92% copper and rest tin with little lead and nickel
D. 70-75% copper and rest tin
E. 90% copper and 10% zinc

A. 0.2%
B. 0.5%
C. 0.8%
D. 1.0%
E. 1.5%.

A. gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt
B. Mg, Zn, Ti, Zr, Br, Cd
C. a iron (below 910°C and between 1400 to 1539°C), W
D. all of the above
E. none of the above

A. austenite
B. pearlite
C. ferrite
D. cementlte
E. bainite

A. 0.1 to 1.2%
B. 1.5 to 2.5%
C. 2.5 to 4%
D. 4 to 4.5%
E. 4.5 to 6.3%.

A. acts as deoxidiser
B. reduces the grain size
C. decreases tensile strength and hardness
D. lowers the toughness and transverse ductility
E. increases hardness

A. along the lines of slag distribution
B. perpendicular to lines of slag distribution
C. uniform in all directions
D. unpredictable
E. none of the above

A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85-92% copper and rest tin with little lead and nickel
D. 70-75% copper and rest tin
E. 70% copper and 30% tin

A. hard
B. high in strength
C. highly resistant to corrosion
D. heat treated to change its properties
E. least resistant to corrosion

A. brass
B. cast iron
C. aluminium
D. steel
E. non-ferrous alloys.