| 22. | For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is
 |
| a. | A |
| b. | B |
| c. | C |
| d. | D |
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Answer: (c).C
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| 23. | A graph between __________ is called Wilson plot.
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| a. | A |
| b. | B |
| c. | C |
| d. | D |
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Answer: (a).A
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| 24. | What is the geometric mean of two heat transfer areas A1 and A2 ?
 |
| a. | A |
| b. | B |
| c. | C |
| d. | D |
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Answer: (a).A
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| 25. | Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately |
| a. | 32 |
| b. | 37 |
| c. | 45 |
| d. | 50 |
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Answer: (a).32
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