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Steam Boilers - Interview Questions and Answers

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31. Ultimate analysis of fuel is determination of percentage of
A. carbon, hydrogen, nitrogen, sulphur, moisture
B. fixed carbon, ash, volatile matter, moisture
C. higher calorific value
D. lower calorific value
E. best analysis.
Explanation:
32. Spontaneous combustion is a phenomenon in which
A. all the fuel burns instantaneously producing high energy release
B. fuel burns with less air
C. coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
D. explosion in furnace
E. none of the above.
Explanation:
33. The safety valve at superheater as compared to drum safety valve setting is set at
A. higher value
B. lower value
C. same value
D. any value
E. none of the above.
Explanation:
34. For combutsion of a fuel, following is essential
A. correct fuel air ratio
B. proper ignition temperature
C. 02 to support combustion
D. all the three above
E. none of the above.
Explanation:
35. A wet vapour can be completely specified by
A. pressure only
B. temperature only
C. dryness fraction only
D. specific volume only
E. pressure and dryness fraction.
Explanation:
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