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Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 196 of 557.

Chemical Engineering MCQs

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A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be________?

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A.Less than that of the un-insulated steam pipe
B.Greater than that for un-insulated steam pipe
C.Equal to that of the un-insulated steam pipe
D.Less than the steam pipe with 5 cms insulation
Explanation: The correct answer is Less than that of the un-insulated steam pipe.

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Pick out the correct statement?

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A.All A., B. and C.
B.With increase in oxygen content, moisture holding capacity of coal increases and the caking power decreases
C.The less the oxygen content, better is the coal, as it reduces the calorific value
D.Oxygen content decreases from lignite to bituminous coal as the coalification increases
Explanation: The correct answer is All A., B. and C..

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