No cutting fluid is normally used, while machining
With increase in carbon percentage in steel, its
Addition of silicon to cast iron
In case of water (Prandtl number ≈flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is
Color of brass changes from yellow to __________ after its dezincification which exemplifies selective leaching.
Pick out the wrong statement.
Holes in a plate for rivetted joints is preferably made by
To improve the machinability of steel by its softening, it is subjected to
Sudden immersion/dipping of red hot steel bar in water makes it
Which of the following relatively employs the highest heat transfer surface area in a high pressure boiler ?
Electric arc furnace is employed mainly for the production of __________ steel.
On increasing the yield strength of a steel fromtoMPa, its __________ will increase.
'End cooler' or 'after cooler' is employed in air compressor mainly to
Which of the following exemplifies resemblence with the extrusion process ?
An orthotropic material is a special class of anisotropic material, which is described by their properties in three perpendicular directions. An example of orthotropic material is
pH value of rain water in India ranges from
Percentage of gaunge is maximum in the ore of
Lead is poured into the joint between two __________ pipes.
Metal cutting by oxy-acetylene flame is accomplished by the __________ of the metal.
The refractory lining of the bottom in a basic electric arc furnace is made of
__________ number is sometimes used in place of Grashoff number in free convection heat transfer.
The dew point of moist air becomes __________ with decrease in its relative humidity.
Heat dissipation in cooling towers is mainly by
Which of the following materials has the least scrap value ?
Shampoos are commercially not available in the form of
A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its
The temperature at which a gas, when subjected to Joule-Thomson expansion, neither cools or heats up, is termed as the __________ temperature. Above this temperature the gas heats up on throttling and below this the gas cools down.
The life of a ball bearing is inversely proportional to
Heat treatment of steel is done mainly to change its
The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is
Streaklines, streamlines & pathlines are almost identical for __________ fluid flow.
The suction and delivery pressure for a two stage compressor are 1 andatm respectively. The intermediate stage pressure would be around __________ atm.
The capital & running costs of similar machines having unequal service life can be compared by the __________ method.
__________ remains constant during the adiabatic cooling of moist air.
Oxide layer formed on the non-ferrous metal surface after its annealing is
The forms in which various metals and non metals occur in nature are called minerals. Which of the following is not a metallic ferrous mineral?
Maraging steels derive their strength from the following mechanism:
About __________ ton of coke is required in a cupola to produce one ton of casting.
The material used for coating the welding electrode is termed as the
Safety matches is produced using
Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is
Wrought iron does not have the
Heating of ferromagnetic materials to a temperature above Curie temperature makes it
In BOF, desiliconisation is a first order reaction. So the silicon content of the metal decreases
Force between the molecules of the same substance is called __________ force.
Stresses encountered in the metal forming processes are less than the __________ of the material.
Carbon is present in the form of __________ in grey cast iron.
Source of heat supply in a cupola is
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