| 1. | Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because |
| a. | the hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot. |
| b. | it reduces its calorific value tremendously. |
| c. | it reduces its flame temperature tremendously. |
| d. | there are chances of explosion during preheating. |
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Answer: (a).the hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot.
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| 2. | Which of the following is the most reactive (as regards the formation of CO + H₂ from C + H₂O) ? |
| a. | Blast furnace coke |
| b. | Low temperature coke |
| c. | Anthracite coal |
| d. | Sub-bituminous coal |
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Answer: (b).Low temperature coke
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| 3. | Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg. |
| a. | 1000 |
| b. | 4000 |
| c. | 6000 |
| d. | 8000 |
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Answer: (b).4000
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| 4. | Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec. |
| a. | 0.5 |
| b. | 10 |
| c. | 50 |
| d. | 500 |
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Answer: (b).10
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| 5. | Which of the following is used for making the explosive 'TNT' ? |
| a. | Benzol |
| b. | Toluene |
| c. | Pyridine |
| d. | Cerosote |
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Answer: (b).Toluene
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