The catalysts are used to accelerate the chemical reaction during the process of ploymerisation of plastics.
Micro-structure of a material is, generally, examined by
A steel with 0.carbon andpearlite is called
Brittle materials when subjected to tensile loads, snap off without giving any sensible elongation.
Muntz metal (Yellow brass) contains
The addition of magnesium to cast iron increases its
18/8 stainless steel consists of
The property of a material necessary for forgings, in stamping images on coins and in ornamental work, is
Which of the following gives the correct order of increasing hot hardness of cutting tool materials?
Killed steels
Vanadium when added to steel
The portion of the blast furnace above its widest cross-section is called
The slag from the blast furnace
The slow cooling of steel from the __________ results in a coarse grained structure.
The limestone in the charge of a blast furnace decomposes to give lime and carbon dioxide. The lime thus obtained
The phosphorus and sulphur in steel making can be removed by using basic bessemer process.
Which of the following is a mesomorphous material?
Which one of the following sets of constituents is expected in equilibrium cooling of a hyper-eutectoid steel from austenitic state?
During the operation of a bessemer converter, the white flame indicates that the silicon and managenese had burnt and carbon has started oxidising.
The heat treatment process used for castings is
The casting ability of aluminium increases when __________ is added to aluminium.
The malleability is the property of a material by virtue of which a material
Manganese bronze has
In a face centred cubic space lattice, there are
In the middle part of the blast furnace (zone of absorption), the temperature is
Which of the following statement is wrong?
A steel is heated at aboutC where the structure consists of entirely austenite. It is then cooled suddenly at a temperature of aboutC toC. This process of heat treatment is known as
The fuel used in a blast furnace is
The temperature in the upper part of the blast furnace (zone of reduction) is __________ that of the middle part.
Duplex process of steel making is a combination of
Silicon bronze contains
Face centred cubic space lattice is found in gamma-iron, aluminium, copper, lead, silver and nickel.
The temperature point at which the change starts on heating the steel is called
In corrosion resistant properties, bronzes are __________ to brasses.
In acidic bessemer process, the furnace is lined with
Which of the following is a point imperfection?
Aluminium bronze has high resistance to corrosion.
Steel containing 0.8 to 1.carbon, is known as
The process in which carbon and nitrogen both are absorbed by the metal surface to get it hardened is known as
Manganese bronze contains more copper than silicon bronze.
The steel produced by cementation process is known as __________ steel.
In process annealing, the hypo-eutectoid steel is
Duralumin has better strength than Y-alloy at high temperature.
Duralumin contains
Delta-iron occurs between the temperature range of
The stiffness is the ability of a material to resist deformation under stress.
Tin base white metals are used where the bearings are subjected to
The ability of a material to absorb energy in the plastic range is called
Tungsten when added to steel __________ the critical temperature.
Iron ore is, usually, found in the form of