Q. The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K⁻¹mole⁻¹)

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Q. Sudden immersion/dipping of red hot steel bar in water makes it

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Q. No cutting fluid is normally used, while machining

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Q. 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

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Q. pH value of rain water in India ranges from

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Q. The capital & running costs of similar machines having unequal service life can be compared by the __________ method.

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Q. Pick the odd man out.

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Q. The speed of sound will be maximum in

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Q. 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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Q. __________ number is sometimes used in place of Grashoff number in free convection heat transfer.

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Q. Wrought iron does not have the

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Q. Hoope's cell is predominantly used for the electrolytic refining of

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Q. Lead percentage in pure galena is about

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Q. Pick out the wrong statement.

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Q. The life of a ball bearing is inversely proportional to

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Q. Pick out the wrong statement.

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Q. Nitriding of steel is a process for

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Q. The maximum percentage of chromium that can be added to steel is about

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Q. Holes in a plate for rivetted joints is preferably made by

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Q. 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.

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