Tensile strength of steel can be safely increased by Adding carbon up to 2.8% Adding carbon up to 6.3% Adding small quantities of copper Adding carbon up to 0.83% TRUE ANSWER : ? YOUR ANSWER : ?
The machinability of aluminium increases when _________ is added to aluminium. Lead and bismuth Silicon Copper Magnesium TRUE ANSWER : ? YOUR ANSWER : ?
Manganese is added in low carbon steel to Make the steel ductile and of good bending qualities All of these Raise the yield point Make the steel tougher and harder TRUE ANSWER : ? YOUR ANSWER : ?
Cast iron is manufactured in Open hearth furnace Cupola Blast furnace Bessemer converter TRUE ANSWER : ? YOUR ANSWER : ?
Recrystallization temperature is one At which crystals grow bigger in size At which change of allotropic form takes place At which crystals first start forming from molten metal when it is cooled At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements? Babbitt metal Phosphor bronze Nichrome Monel metal TRUE ANSWER : ? YOUR ANSWER : ?
When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite. Less than More than None of these Equal to TRUE ANSWER : ? YOUR ANSWER : ?
The property of a material due to which it breaks with little permanent distortion, is called Malleability Brittleness Ductility Plasticity TRUE ANSWER : ? YOUR ANSWER : ?
According to Indian standard specifications, plain carbon steel designated by 40 C8 means that the carbon content is 0.35 to 0.45% 0.0004 0.6 to 0.8% 0.4 to 0.6% TRUE ANSWER : ? YOUR ANSWER : ?
Gamma-iron occurs between the temperature ranges of 1400°C to 1530°C 900°C to 1400°C 400°C to 600°C 600°C to 900°C TRUE ANSWER : ? YOUR ANSWER : ?