Engineering :: Fuels and Combustion
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| 11. |
The lowest temperature at which a solid fuel produces enough vapours to support continuous combustion is called |
| A. |
flash point |
B. |
kindling temperature |
| C. |
burning temperature |
D. |
none of the above |
Answer: Option B
Explanation:
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| 12. |
Ignition of liquid fuel at its flash point would cause |
| A. |
no combustion |
B. |
continuous combustion |
| C. |
no momentary flash |
Answer: Option C
Explanation:
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| 13. |
Ignition of liquid fuel at its fire point would cause |
| A. |
continuous combustion |
B. |
a momentary flash |
| C. |
no combustion |
Answer: Option A
Explanation:
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| 14. |
Excess air is to be supplied for combustion to be complete due to |
| A. |
its incomplete mixing |
B. |
obstruction of inert gas molecules |
| C. |
chemical equilibrium |
D. |
all of the above |
Answer: Option D
Explanation:
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| 15. |
The most economic fuels are |
| A. |
solid fuels |
B. |
liquid fuels |
| C. |
gaseous fuels |
Answer: Option C
Explanation:
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| 16. |
Wood at its kindling temperature will |
| A. |
burn momentarily then go out |
B. |
not burn at all |
| C. |
burn continuously |
Answer: Option C
Explanation:
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| 17. |
Which would yield more energy when completely burned? |
| A. |
methane |
B. |
ethane |
| C. |
propane |
D. |
butane |
Answer: Option D
Explanation:
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| 18. |
Which would give the greater amount of heat per cubic foot? |
| A. |
Hydrogen |
B. |
Carbon monoxide |
| C. |
Hydrogen sulphide |
D. |
Methane |
Answer: Option D
Explanation:
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| 19. |
Which would give the greater amount of heat per cubic foot? |
| A. |
Hydrogen |
B. |
Natural gas |
| C. |
Liquefied petroleum gas |
D. |
Gobar gas |
Answer: Option C
Explanation:
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| 20. |
What is the explosive range for hydrogen |
| A. |
4.1 to 74.2 % |
B. |
5.3 to 14.0 % |
| C. |
3.2 to 12.5 % |
D. |
2.1 to 9.4 % |
Answer: Option A
Explanation:
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