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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