Large forgings, crank shafts, axles normally contain carbon up to________________?
(A) 0.05 to 0.20%
(B) 0.20 to 0.45%
(C) 0.45 to 0.55%
(D) 0.55 to 1.0%
(D) 1.0 to 1.2%.
Cold rolled steel sheets contain carbon of the following order___________________?
(A) 0.1%
(B) 0.2%
(C) 0.4%
(D) 0.6%
(D) 0.8%
Which of the following element results in presence of free graphite in C.I_________________?
(A) carbon
(B) sulphur
(C) silicon
(D) manganese
(D) phosphorous
The machinability of steel is increased by___________________?
(A) silicon and sulphur
(B) phosphorous, lead and sulphur
(C) sulphur, graphite and aluminium
(D) phosphorous and aluminium
(D) none of the above
Blast furnace produces following by reduction of iron ore_______________?
(A) cast iron
(B) pig iron
(C) wrought iron
(D) malleable iron
(D) white iron
Grey cast iron_____________________?
(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
(D) none of the above is true
Nickel in steel___________________?
(A) improves wear resistance, cutting ability and toughness
(B) refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper¬ties
(C) improves cutting ability and reduces hardenability
(D) gives ductility, toughness, tensile strength and anticorrosion properties
(D) none of the above
The presence of sulphur in pig iron makes__________________?
(A) it easily machinable
(B) it brittle
(C) it hard
(D) the casting unsound
(D) increases the fluidity
Compressive strength of grey cast iron in tonnes/cm is of the order of___________________?
(A) 3- 5
(B) 5-7
(C) 7-10
(D) 10-15
(D) 15-22
Cupola produces following material__________________?
(A) cast iron
(B) pig iron
(C) wrought iron
(D) malleable iron
(D) white iron