Mechanical Engineering Mcqs

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

A. manganese
B. magnesium
C. nickel
D. silicon
E. none of the above

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 and is obtained by cooling rapidly. It is almost unmachinable
C. is produced by annealing process. It is soft, tough and easily machined metal
D. is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
E. none of the above

A. cold rolled steel
B. hot rolled steel
C. forged steel
D. cast steel
E. carbon-chrome steel

A. 0.2%
B. 0.5%
C. 0.8%
D. 1.0%
E. 1.5%.

A. 0.1 to 0.2%
B. 0.25 to 0.5%
C. 0.6 to 0.7%
D. 0.7 to 0.9%
E. 1.0 to 1.2%.

A. along the lines of slag distribution
B. perpendicular to lines of slag distribution
C. uniform in all directions
D. unpredictable
E. none of the above