| 46. | When the temperature and humidity of air is low, we usually use __________ draft cooling tower. |
| a. | natural |
| b. | forced |
| c. | induced |
| d. | none of these |
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Answer: (a).natural
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| 47. | Make up water is required in a cooling tower to replace the water lost by |
| a. | evaporation |
| b. | drift |
| c. | blowdown and leakage |
| d. | all (a), (b) and (c) |
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Answer: (d).all (a), (b) and (c)
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| 48. | Which of the following quantities need not be fixed before starting the design of a co-current absorber ? |
| a. | Heat gain or loss |
| b. | Flow rate of entering liquid |
| c. | Flow rate of gas |
| d. | None of these |
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Answer: (b).Flow rate of entering liquid
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| 49. | Mass transfer co-efficient of liquid is |
| a. | affected more by temperature than that for gases. |
| b. | affected much less by temperature than that for gases. |
| c. | not affected by the temperature. |
| d. | none of these. |
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Answer: (a).affected more by temperature than that for gases.
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| 50. | Absorption accompanied with chemical reaction is exemplified by the absorption of |
| a. | ammonia in water. |
| b. | benzol present in coke oven gas by wash oil. |
| c. | SO₂ in alkaline solution. |
| d. | all (a), (b) and (c). |
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Answer: (c).SO₂ in alkaline solution.
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