Q. In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following :

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Q. __________ remains constant during the adiabatic cooling of moist air.

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Q. __________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently.

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Q. Out of the following, the alloy which has equal percentage of constituents, is

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Q. Steel is welded using the __________ flame.

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Q. Oxide layer formed on the non-ferrous metal surface after its annealing is

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Q. Silicon percentage in silicon steel used for electrical equipments is about

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Q. Catalyst used in the 'catalytic converter' employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is

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Q. Liquid nitrogen containers can be made from

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Q. Materials having __________ lattice structure are usually the most ductile.

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Q. In cold working of metal as compared to its hot working

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Q. __________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.

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Q. Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.

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Q. Which of the following is a weak acid ?

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Q. Pig iron is a product of

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Q. Safety matches is produced using

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Q. Calorific value of __________ are almost same.

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Q. Which of the following pairs is not correctly matched ?

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Q. Commonly used flux for brazing is

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Q. Iron has got __________ isotopes.

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