The following element can’t impart high strength at elevated temperature__________________?
(A) manganese
(B) magnesium
(C) nickel
(D) silicon
(D) none of the above
White 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 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
(D) none of the above
Pipes for bicycle frames are made of___________________?
(A) cold rolled steel
(B) hot rolled steel
(C) forged steel
(D) cast steel
(D) carbon-chrome steel
Heavy duty leaf and coil spring* contain carbon of the following order ________________?
(A) 0.2%
(B) 0.5%
(C) 0.8%
(D) 1.0%
(D) 1.5%.
Drop forging dies contain carbon of the order of_________________?
(A) 0.1 to 0.2%
(B) 0.25 to 0.5%
(C) 0.6 to 0.7%
(D) 0.7 to 0.9%
(D) 1.0 to 1.2%.
Steel made from phosphatic iron is_________________?
(A) brittle
(B) hard
(C) ductile
(D) tough
(D) malleable
Which one of the following metals would work-harden more quickly than the others__________________?
(A) copper
(B) brass
(C) lead
(D) silver
(D) aluminium
The composition of silver solder is ___________________?
(A) silver, copper, zinc
(B) silver, tin, nickel
(C) silver, lead, zinc
(D) silver, copper, aluminium
(D) silver, lead, tin
The hardness of steel primarily depends on _____________________?
(A) %age of carbon
(B) %age of alloying elements
(C) heat treatment employed
(D) method of manufacture
(D) shape of carbides and their distribution in iron
Malleable cast iron _________________?
(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
(D) none of the above