A material is called 'ductile', if it can be
SO3 is absorbed using H2SO4 in a
Ball bearings are normally made of __________ steel.
Carbon is present in steel wholly in the
Heavy duty bearings are usually made of
Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by
The addition of antimony in tin-based alloys improves its
Specify the material of construction suitable for handling concentrated HNO3 at 100°C.
Which of the following mechanical properties of a material is most structure insensitive ?
Plastics are
Shock resisting steels should possess high
The softest material just next to talc in the Mhos scale is
In drop forging process, the forging is done by dropping the __________ at high velocity.
The formation of oxide film on a metal due to atmospheric exposure reduces its
Which of the following is not a copper based alloy with nickel ?
Pipes for bi-cycle frames are made of __________ steel.
The chlorinator used in the manufacture of DDT is made of
A chemical change takes place when iron
Carbon percentage in medium carbon steel is around
The electrical conductivity of a __________ decreases with rise in temperature.
Carbon supply in pack carburising process is in the form of
The melleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the miximum malleability ?
Aluminium storage vessel can be used to store
Mercury is transported in metal containers made of
Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ?
Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of
The purpose of nitriding the steel is to
Which of the following is not an alloy of copper and tin ?
A hardened steel essentially contains
Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C ?
Failure of a material is termed as fatigue failure, if it fails below the yield point. The resistance to fatigue failure of a material is measured by the
An ideal material of construction for the storage ofcaustic soda solution would be
Carbon percentage is the same in cast iron and
Reduction in the grain size reduces the __________ of the material.
Evaporator used for concentrating tomato juice is made of
High carbon steel contains more than __________ percent carbon.
The preferred material of construction for storage tanks forsulphuric acid is
Which one occupies the lowermost position in the electromotive series of metals ?
In SO3 absorber (Contact Process), packing material used is of
Silicone rubber is not resistant to the corrosive action of
Which of the following has the least carbon percentage ?
Wood is corroded by
Interchain forces are the weakest in case of
Bog iron used for the adsorption of H2S from coke oven gas is
Which of the following is the hardest ?
Pick out the wrong statement.
Which of the following has the highest density and the lowest melting point ?
Age hardening is concerned with
The main constituent of carborundum is __________ carbide.
Addition of nickel to copper improves its