| 56. | Heat waves |
| a. | can not pass through vacuum. |
| b. | travel in straight line. |
| c. | can be reflected by a mirror. |
| d. | both (b) and (c). |
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Answer: (d).both (b) and (c).
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| 57. | Air is best heated with steam in a heat exchanger of |
| a. | plate type. |
| b. | double pipe type with fin on steam side. |
| c. | double pipe type with fin on air side. |
| d. | shell and tube type. |
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Answer: (c).double pipe type with fin on air side.
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| 58. | Which of the following is generally considered as opaque surface towards radiations? |
| a. | Gases |
| b. | Solids |
| c. | Liquids |
| d. | Both (b) and (c) |
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Answer: (d).Both (b) and (c)
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| 59. | Black liquor generated during paper manufacture is concentrated in a |
| a. | single effect evaporator. |
| b. | single effect evaporator followed by a crystalliser. |
| c. | multiple effect evaporator. |
| d. | multiple effect evaporators followed by a crystalliser. |
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Answer: (c).multiple effect evaporator.
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| 60. | When vaporisation takes place directly at the heating surface, it is called |
| a. | film boiling |
| b. | nucleate boiling |
| c. | vapour binding |
| d. | none of these |
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Answer: (b).nucleate boiling
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