| 26. | In a heat exchanger, floating head is provided to |
| a. | facilitate cleaning of the exchanger. |
| b. | increase the heat transfer area. |
| c. | relieve stresses caused by thermal expansion. |
| d. | increase log mean temperature gradient. |
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Answer: (c).relieve stresses caused by thermal expansion.
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| 27. | Leidenfrost point is a term concerned with the |
| a. | condensation of the saturated vapor on a cold surface. |
| b. | concentration of a corrosive solution by evaporation. |
| c. | heat transfer between two highly viscous liquids. |
| d. | boiling of a liquid on a hot surface. |
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Answer: (d).boiling of a liquid on a hot surface.
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| 28. | A process stream of dilute aqueous solution flowing at the rate of10 Kg.s⁻¹ is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s⁻¹. A 1 - 1 shell and tube heat exchanger is available. The best arrangement is |
| a. | counter flow with process stream on shell side. |
| b. | counter flow with process stream on tube side. |
| c. | parallel flow with process stream on shell side. |
| d. | parallel flow with process stream on tube side. |
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Answer: (a).counter flow with process stream on shell side.
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| 29. | Heat produced when a steady state current, I passes through an electrical conductor having resistance, 'R' is |
| a. | IR |
| b. | I²R |
| c. | IR² |
| d. | I²R² |
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Answer: (b).I²R
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| 30. | Kirchoff s law applies to __________ radiation. |
| a. | total |
| b. | monochromatic |
| c. | both (a) & (b) |
| d. | neither (a) nor (b) |
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Answer: (c).both (a) & (b)
|