Category: Engineering Materials

A. 1539°C
B. 1601°C
C. 1489°C
D. 1712°C
E. 1131°C

A. RC 65
B. RC 48
C. RC 57
D. RC 80
E. RC 32

A. 0.02%
B. 0.3%
C. 0.63%
D. 0.8%
E. 1.2%.

A. steel
B. A1203
C. Si02
D. MgO
E. german silver

A. chromium and nickel
B. sulphur, phosphorus, lead
C. vanadium, aluminium
D. tungsten, molybdenum, vanadium, chromium
E. zinc

A. amount of carbon it contains
B. the shape and distribution of the car-bides in iron
C. method of fabrication
D. contents of alloying elements
E. the quality of ore from which it is made

A. improvement of casting characteristics
B. improvement of corrosion resistance
C. one of the best known age and precipitation-hardening systems
D. improving machinability
E. none of the above

A. hot hardness
B. toughness
C. wear resistance
D. sharp cutting edge
E. cold hardness

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. 70-78% copper and rest tin
E. 85-92% copper and rest zinc

A. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
B. is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable
C. is produced by annealing process. I is soft, tough and easily machinec metal
D. is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughout the material
E. none of the above is true