| 36. | The number of kg vaporised per kg of steam fed to the evaporator is defined as |
| a. | capacity |
| b. | rate of evaporation |
| c. | economy |
| d. | rate of vaporisation |
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Answer: (c).economy
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| 37. | Pick out the wrong statement. |
| a. | In case of heat transfer by purely forced convection, GR/Re² ≤ 1. |
| b. | The equivalent diameter of heat transfer for a duct of square cross-section (having each side as 'x') is equal to 4x. |
| c. | Distillation process is not the same as evaporation. |
| d. | The effectiveness of nucleate boiling depends basically on the ease with which the bubbles are formed and detached from the heating surface. |
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Answer: (b).The equivalent diameter of heat transfer for a duct of square cross-section (having each side as 'x') is equal to 4x.
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| 38. | Economy of a multiple effect evaporator is not influenced much by the |
| a. | boiling point elevations |
| b. | temperature of the feed |
| c. | rate of heat transfer |
| d. | ratio of the weight of the thin liquor to thick liquor |
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Answer: (a).boiling point elevations
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| 39. | Increasing the liquor level in the evaporator results in the |
| a. | decreased capacity. |
| b. | increase in liquor film co-efficient. |
| c. | decreased effect of hydrostatic head. |
| d. | increased true temperature drop. |
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Answer: (a).decreased capacity.
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| 40. | Pick out the wrong statement. |
| a. | Orifice baffles are never used in a shell and tube heat exchanger. |
| b. | Pressure drop on the shell side of a heat exchanger depends upon tube pitch also. |
| c. | In a horizontal tube evaporator, surface blanketing by air is avoided. |
| d. | Split ring type and pull through type floating heads are two commonly used floating heads is heat exchangers. |
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Answer: (a).Orifice baffles are never used in a shell and tube heat exchanger.
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