Q. Out of the following surfaces, the emis-sivity will be minimum for

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Q. The property of material, by which a given amount of energy is absorbed by it without plastic deformation, is called the

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Q. The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void.

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Q. __________ the exhaust gas is an indication of the incomplete combustion of fuel.

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Q. Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be

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Q. Frost formation on the evaporator tubes in the domestic refrigerators

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Q. Function of feed check valve in a boiler is to

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Q. Preheating prior to welding is done for the purpose of

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Q. Presence of sulphur in steel reduces the

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Q. Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?

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Q. Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.

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Q. Fire on fuel oil lines can be extinguished by

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Q. In a furnace with heating element temperature at 1700°C, the dominant machanism of heat transfer will be

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Q. Optical activity is a/an __________ property.

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Q. Solution loss reaction occurs

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Q. Out of the following materials, the one which generally exhibits an yield point is

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Q. The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 - T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by

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Q. 'Flare tower' used in industry is meant for

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Q. Which of the following has the highest modulus of elasticity (about 7 x 10⁶ kg/cm²) ?

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Q. Electrolytic reduction cell used for conversion of calcined Al₂O₃ to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to

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