Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process ?
Out of the following __________ iron has the best capability to bear sudden & excessive shocks.
An abrupt and sudden fall in the readinp of barometer is an indication of the
Steam condenser tubes are made of ad-mirability brass, in which percentage of zinc & copper are __________ respectively.
Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that
The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel.
Fine grained steels have
Which of the following materials has the poorest electrical conductivity ?
Duralumin is an alloy of aluminium and copper. Percentage of copper in duralumin is
Thermal equivalent of electrical power in practical calculation is __________ kcal/kWh.
Gross & Net calorific values will be the same for
LVDT used for displacement measurement is a/an __________ transducer.
'GASOHOL' widely used in Brazil as a motor fuel is a mixture of alcohol and
On decreasing the grain size of a polycrys-talline material, the property most likely to deteriorate is
Material having negative co-efficient of linear expansion is
The most suitable material for die casting is
The cost of providing service in a queing system decreases with the
The activity co-efficient of the solute in a dilute solution
Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and
Cassiterite is an ore of
Rockwell number represents the
Copper is not present as an alloying constituent in
As per the Indian boiler regulation (IBR), the type of joint preferred for the circumferential joint is the __________ joint.
A static fluid can not have
It is possible to form martensite
Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag.
__________ is the hardest material out of the following.
Heating of an ore below its melting point in presence of excess of air is called
Constituents of stellite are
Electrometallurgy is not involved in the extraction of __________ from its ore.
In sheet metal forming, stretcher strains occur in
Which of the following fastening devices has its both ends threaded ?
Lead is added to 60:brass primarily to improve
Presence of small quantity of sulphur in low carbon steel improves its
In a forced draft cooling tower, water is cooled fromto 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the
Which of the following material handling equipments is not suitable for moving materials in varying paths ?
The phenomenon of weld decay is found in case of
Depreciation of machines fails under the indirect expenses head. As per income tax regulations, it is calculated by the __________ method.
The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for __________ at room temperature.
For grinding of softer materials, the grinding wheel should have __________ grain size.
Air intake for an air compressor should be preferably taken from
Which of the following is the most elastic material ?
A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalant bonds resulting in __________ electrons.
Current asset of a factory includes the
The 'laughing gas' is
Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.
Annealing ofwhite cast iron produces __________ iron.
In extrusion of metals, which of the following statement is true ?
Area under the stress-strain curve upto the __________ is referred to as the modulus of resilience.
Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as
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