Category: Engineering Materials

A. dipping steel in cyanide bath
B. reacting steel surface with cyanide salts
C. adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
D. obtaining cyanide salts
E. making corrosion resistant steel

A. 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi
B. 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg
C. 87% Sn, 4% Cu, 8% Sb, 1% Al
D. 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg
E. none of the above

A. copper
B. chromium
C. nickel
D. silicon
E. none of the above

A. It contains carbon of the order of 0 to 0.25%
B. It melts at 1535°C
C. It is very soft and ductile
D. It can be easily forge welded
E. It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling

A. below 723°C
B. 770 – 910°C
C. 910-1440°C
D. 1400-1539°C
E. above 1539°C

A. has a fixed structure under all conditions
B. exists in several crystal forms at different temperatures
C. responds to heat treatment
D. has its atoms distributed in a random pattern
E. none of the above

A. mild steel
B. alloy steel
C. high carbon
D. tungsten steel
E. cast iron steel

A. cementite
B. free carbon
C. flakes
D. spheroids
E. nodular aggregates of graphite

A. hot working
B. tempering
C. normalising
D. annealing
E. special heat treatment

A. raw material for blast furnace
B. product of blast furnace made by reduction of iron ore
C. iron containing huge quantities of carbon
D. iron in molten form in the ladles
E. iron scrap