Mechanical Engineering MCQs

A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85-92% copper and rest tin with little lead and nickel
D. 70-75% copper and rest tin

A. B.c.c. crystalline structure
B. F.c.c. crystal structure
C. H.c.p. structure
D. A complex cubic structure

A. Brittle
B. Hard
C. Ductile
D. Tough

A. Copper
B. Brass
C. Lead
D. Silver

A. Silver, copper, zinc
B. Silver, tin, nickel
C. Silver, lead, zinc
D. Silver, copper, aluminium

A. Contains l.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 cerium) in the ladle. graphite is in the nodular or spheroidal form and is well dispersed throughout the material

A. %age of carbon
B. %age of alloying elements
C. heat treatment employed
D. method of manufacture

A. Improves wear resistance, cutting ability and toughness
B. Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C. Improves cutting ability and reduces hardenability
D. Gives ductility, toughness, tensile strength and anticorrosion properties

A. Shot peening
B. Nitriding of surface
C. Cold working
D. Surface decarburisation

A. 0.1 to 0.3%
B. 0.3 to 0.6%
C. 0.6 to 0.8%
D. 0.8 to 1.5%