- (A) 0.05 to 0.20%
- (B) 0.20 to 0.45%
- (C) 0.45 to 0.55%
- (D) 0.55 to 1.0%
- (E) 1.0 to 1.2%.
Mechanical Engineering Mcqs
- (A) 0.1%
- (B) 0.2%
- (C) 0.4%
- (D) 0.6%
- (E) 0.8%
- (A) carbon
- (B) sulphur
- (C) silicon
- (D) manganese
- (E) phosphorous
- (A) silicon and sulphur
- (B) phosphorous, lead and sulphur
- (C) sulphur, graphite and aluminium
- (D) phosphorous and aluminium
- (E) none of the above
- (A) cast iron
- (B) pig iron
- (C) wrought iron
- (D) malleable iron
- (E) white 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
- (E) none of the above is true
- (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
- (E) none of the above
- (A) it easily machinable
- (B) it brittle
- (C) it hard
- (D) the casting unsound
- (E) increases the fluidity
- (A) 3- 5
- (B) 5-7
- (C) 7-10
- (D) 10-15
- (E) 15-22
- (A) cast iron
- (B) pig iron
- (C) wrought iron
- (D) malleable iron
- (E) white iron
