Related Questions
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In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is
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4
Faraday's law of electrolysis is related to the
B. Atomic number of the cation
C. Equivalent mass of the electrolyte
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4
Which of the following contributes maximum as main source of sulphur in the blast furnace charge?
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Wohler test is a destructive test to find out the __________ strength of a prepared metal specimen.
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4
Broaching tools are usually made of
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Silicon percentage in acid resistant cast iron is about
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Drossing is a __________ operation.
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The main reducing agent in iron blast furnace is
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Which of the following does not have a sharp melting point?
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Wrought iron is never shaped by
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The cathode in an electrochemical cell always carries
D. Positive or negative charge depending upon the nature of the cell
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Strain hardening effect in metals subjected to cold working is due to the __________ mechanism.
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Removal of non-condensable from steam or other vapour is termed as the __________ process.
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The order of a chemical reaction
A. Can be determined only experimentally
B. Can be determined from the stoichiometry of the reaction
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Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its
C. Resistance to vegetable acids as the tin plate are commercially used in 'canning' industry
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Case hardening is not done by
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Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.
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Maximum change in the hardness of martensite occurs in the carbon content range of __________ percent in steel.
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Titanium is added to molten aluminium alloys before casting for the purpose of
B. Increasing corrosion resistance
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Dislocations are __________ defects.
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Routing in production, planning & control is concerned with the
A. Sequence of operation to be performed
B. Progress of work performed
C. Authorisation of work to be performed
D. Balancing of load on machines
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4
Bad odour in sanitary latrines is reduced by periodically sprinkling
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Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.
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Increasing sulphur content in pig iron tends to make it
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Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and
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Most important property of steels for use in automobile bodies is the
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Consideration of the creep is the most important in case of the
B. Piston of an I. C. engine
C. Flywheel of steam engine
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Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to
A. Achieve very high purity of aluminium (99.9%)
B. Keep the electrolyte in liquid condition by the generation of heat
C. Electrolytically dissociate alumina
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4
Joule-Thomson co-efficient is the ratio of
A. Pressure change to temperature change occuring during adiabatic compression of a gas
B. Pressure change to temperature change occuring during adiabatic throttling of a gas
C. Temperature change to pressure change occuring during adiabatic compression of a gas
D. Temperature change to pressure change occuring during adiabatic throttling of a gas
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4
Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about