Q. Which of the following metals occurs in nature in their free metallic state ?

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Q. The most suitable material for a sewer for carrying storm water is

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Q. In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be

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Q. Sulphur is melted in the sulphuric acid plant most commonly by employing

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Q. Coke is added in the blast furnace to

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Q. A balanced draught boiler furnace employs __________ draught fan.

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Q. Aluminium oxide (an abrasive) is used for grinding

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Q. In a casting, cold shut defect is caused by

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Q. Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when

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Q. Lead is most readily dissolved in

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Q. Which of the following is a synthetic abrasive ?

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Q. Dezincification is a form of corrosion, which specifically applies to

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Q. Water hammer in pipelines results, when the flowing fluid

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Q. The preferred alloying element for low temperature applications of steel is

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Q. Production of one ton of steel plate in a modern integrated steel plant in India consumes about __________ kWh of electricity.

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Q. Ceramic tips for the cutting tool are prepared from __________ powder.

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Q. Fatigue strength of a metal is improved by

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Q. Saturated steam at a pressure of 25 kg/cm² is throttled to attain 5 kg/cm² . Then the outcoming steam will be

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Q. An "orange peel" effect is observed

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Q. Which of the following is a boiler accessory i.e., not a boiler mounting ?

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