a) 0.15 – 0.20 b) 0.22 – 0.28 c) 0.29 – 0.32 d) none of the above
2. Grade B Indian coal has a energy content range (in kcal/kg) of
a) 3360-4200 b) 4200-4900 c) 4940-5600 d) 5600-6200
3. Which of the following fuel requires maximum air for stoichiometric combustion?
a) Butane b) Propane c) Hydrogen d) Coal
4. Stochiometric air required for combustion of Bagasse is about
a) 13.7 b) 3.2 c) 6 d) 18
5. Which fuel releases the most energy per kg on complete combustion
a) Carbon b) Sulphur c) Nitrogen d) Hydrogen
6. How many kg of CO2 are produced in complete combustion of 16 kg of Methane?
a) 42 b) 44 c) 16 d) none of the above
7. In flue gas the theoretical CO2 is 15.5% and measured CO2 is 11% by volume. The percentage of excess air will be
a) 40.9% b) 38.7 % c) 240.9 % d) 140.9 %
8. The lowest excess air is required in a
a) coal burner b) low pressure oil burner c) high pressure gas burner d) high pressure oil burner
9. Which of the following is not measured in ultimate analysis?
a) carbon b) sulphur c) hydrogen d) ash
10. With increase in the percentage of excess air for combustion of coal, percentage of CO2 in flue gas.
a) increases b) decreases c) remains same d) none of the above
11. Which of the following requires the least amount of oxygen /kg for complete combustion
a) Carbon b) Sulphur c) Hydrogen d) Methane
12. Which of these fuels has the highest heating value?
a) Methane b) Hydrogen c) Diesel d) LPG
13. LPG is predominantly the mixture of Propane and ___
a) Methane b) Ethane c) Butane d) Isopropane
14. Natural gas consists of mainly the following
a) Ethane b) Methane c) Propane d) Butane
15. is required for the simple estimation of flame temperature of the fuel.
a) Ultimate analysis b) Proximate analysis c) Size of the coal d) All of the above
16. The large difference between GCV and NCV of gaseous fuels is due to their
a) large moisture content b) negligible moisture content c) low hydrogen content d) large hydrogen content
17. Which of the following contributes to spluttering of flame at burner tip during combustion of fuel oil?
a) ash content b) water content c) sulphur content d) humidity of air
18. For coal fired system the flame length is dictated by
a) moisture b) volatile matter c) ash content d) fixed carbon
19. Which one of the following is not true with respect to the role of nitrogen in the combustion of any fuel
a) produces oxides of nitrogen b) reduces the volume of combustion by-products c) dilutes the flue gases d) carries useful heat in flue gases
20. Which one of the following fuel has the highest hydrogen content and lowest sulphur content
a) coal b) fuel oil c) natural gas d) LSHS
21. For stoichiometric combustion of 1 kg of carbon, the required amount of air will be about
a) 31 kg b) 21 kg c) 11.6 kg d) 2.67 kg
22. The stoichiometric air to natural gas ratio by volume for complete combustion is
a) 14-15 b) 7-8 c) 9.5-10.5 d) none of the above
23. How much kg of SO2 is produced in complete combustion of 32 kg of sulphur?
a) 16 b) 32 c) 64 d) 128
24. 100 kg of a fuel contains 3% sulphur. For complete combustion of sulphur in the fuel it will require _________kg of oxygen
a) 3 b) 6 c) 30 d) 103
25. Which property indicates the lowest temperature at which fuel oil is readily pumpable?
a) flash point b) pour point c) specific heat d) specific volume
26. The factor that influences atomisation of fuel oil is
a) viscosity b) density c) flash point d) pour point
27. Which of the following is not measured in ultimate analysis?
a) carbon b) sulphur c) hydrogen d) moisture
28. The unit of specific gravity in SI system is
a) kg/ m3 b) m3/kg c) gm/cc d) none of the above
29. The density of a substance relative to water is called
a) viscosity b) specific gravity c) dew point d) pour point
30. Liquid fuel density is measured by an instrument called
a) tachometer b) hydrometer c) anemometer d) none of the above
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