| 1. | Boiling refers to a change from the |
| a. | Solid to a liquid phase |
| b. | Vapor to a liquid phase |
| c. | Liquid to a solid phase |
| d. | Liquid to a vapor phase |
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Answer: (d).Liquid to a vapor phase
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| 2. | The boiling process has wide-spread applications in
(i) Production of steam in nuclear and steam power plants for generation and for industrial processes and space heating (ii) Absorption of heat in refrigeration and air-conditioning systems (iii) Concentration, dehydration and drying of foods and materials Identify the correct statements |
| a. | 1 and 2 |
| b. | 2 and 3 |
| c. | 1, 2 and 3 |
| d. | 1 and 3 |
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Answer: (c).1, 2 and 3
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| 3. | Maximum heat transfer rate in a modern boiler is about |
| a. | 2 * 10⁵ W/m² |
| b. | 3 * 10⁵ W/m² |
| c. | 4 * 10⁵ W/m² |
| d. | 5 * 10⁵ W/m² |
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Answer: (a).2 * 10⁵ W/m²
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| 4. | Which type of boiling occurs in steam boilers employing natural convection? |
| a. | Forced convection |
| b. | Pool |
| c. | Local |
| d. | Saturated |
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Answer: (b).Pool
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| 5. | In which type of boiling the fluid motion is induced by external means? |
| a. | Pool |
| b. | Local |
| c. | Forced convection |
| d. | Subcooled |
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Answer: (c).Forced convection
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