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1329. 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

Greater than that for uninsulated steam pipe
Less than that of the uninsulated steam pipe
Equal to that of the uninsulated steam pipe
Less than the steam pipe with 5 cms insulation
✅ The correct answer is option B.

1331. A 2-4 heat exchanger involves

Only counter-flow of fluids
Only parallel-flow of fluids
Both counter and parallel-flow of the fluids
Smaller pressure drop compared to 1-2 exchanger
✅ The correct answer is option C.

1299. In a heat exchanger, one transfer unit means

A section of the exchanger in which change in temperature of one stream equals the average driving force in the section
The size of the exchanger in which heat transfer rate is 1 kcal/hr
Both A and B
None of these
✅ The correct answer is option A.
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