Q. Upto the critical radius of insulation, added insulation, will

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Q. Limestone is added in the blast furnace (during pig iron manufacture) to

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Q. Cementite is in the lamellar form in the __________ phase of steel.

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Q. To improve the machinability of steel, it is generally subjected to

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Q. Silicon in steel

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Q. The noble metals

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Q. Which of the following is an example of cathodic protection of metals against corrosion ?

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Q. Thermal efficiency of an internal combustion engine is around __________ percent.

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Q. Pick out the correct combination about the role of various additives used in polymers.

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Q. The lightest non-inflammable gas is

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Q. Electrometallurgical methods of metal extraction is normally used for those metals

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Q. Lowering of recrystallisation temperature of metals can be achieved by its

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Q. An example of a buffer solution is

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Q. A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.

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Q. Name the safety device used to protect the boiler, when the water level falls below a minimum level.

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Q. Earing is a defect found in steels after the following metal working operation (s).

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Q. For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.

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Q. Hydrogen can be

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Q. __________ wire is never used for making the heating element.

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Q. Which of the following has the least oili-ness ?

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