Category: Engineering Materials

A. which are destroyed by burning
B. which after their destruction are recycled to produce fresh steel
C. which are deoxidised in the ladle with silicon and aluminium
D. in which carbon is completely burnt
E. which have poor properties due to improper manufacturing

A. silver and some impurities
B. refined silver
C. nickel, copper and zinc
D. nickel and copper
E. silver and gold

A. 1% silver
B. 2.5% silver
C. 5% silver
D. 10% silver
E. 100% silver

A. cast iron
B. high speed steel
C. all non-ferrous materials
D. all of the above
E. none of the above

A. creep
B. hot tempering
C. hot hardness
D. fatigue
E. superhardening

A. chromium and nickel
B. nickel and molybdenum
C. aluminium and zinc
D. tungsten and sulfur
E. none of the above

A. 50 : 50
B. 40 : 60
C. 60 : 40
D. 20 : 80
E. 80 : 20

A. 63 to 67% nickel and 30% copper
B. 88% copper and 10% tin and rest zinc
C. alloy of tin, lead and cadmium
D. malleable iron and zinc
E. none of the above

A. room temperature
B. near melting point
C. between 1400°C and 1539°C
D. between 910°C and 1400°C
E. none of the above

A. hard’
B. soft
C. ductile
D. tough
E. malleable