Q. Preheating before welding is done to

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Q. Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)

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Q. Dew point temperature always gives an indication of the __________ of the moist air.

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Q. Hot extrusion of aluminium is done in the temperature range of __________ °C.

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Q. Stellite is a __________ material.

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Q. Percentage of argon (by volume) in dry atmospheric air is about

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Q. An abrupt and sudden fall in the readinp of barometer is an indication of the

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Q. Steam condenser tubes are made of ad-mirability brass, in which percentage of zinc & copper are __________ respectively.

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Q. Dislocation cross-slip is difficult in those materials, which have

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Q. Shrinkage allowance on pattern is provided to compensate for shrinkage when the

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Q. Spark plug is provided in a/an

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Q. Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as

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Q. For the irreversible reaction, Ca+ 2C = CaC₂ , Δ H°298 = - 60000 J . mole⁻¹ . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be

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Q. Projection welding & stud welding is categorised as the __________ welding.

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Q. The driving force for the sintering of a powder compact is

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Q. The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.

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Q. Volumetric composition of flue gas analysed with the Orsat apparatus is : CO₂ = 12%, O₂ = 8%, CO = nil, N₂ = 80%. This flue gas composition indicates that

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Q. Coating provided on the electrodes used in the arc welding is not expected to

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Q. Desalination of water

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Q. Viscoelastic behaviour is observed in __________ materials.

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