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Power Plant Engineering - Interview Questions and Answers

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31. The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is
A. 0.6
B. 0.578
C. 0.555
D. 0.5457
Explanation:
32. In a boiler installation the natural draught is produced
A. due to the fact that furnace gases being light go through the chimney giving place
B. ld air from outside to rush in
C. due to the fact that pressure at the grate due to cold column is higher than the
D. ure at the chimney base due to hot column
Explanation:
33. The pressure at the furnace is minimum in case of
A. forced draught system
B. induced draught system
C. balanced draught system
D. natural draught system
Explanation:
34. The maximum percentage gain in Regenerative feed heating cycle thermal efficiency
A. increases with number of feed heaters increasing
B. decreases with number of feed heaters increasing
C. remains same unaffected by number of feed heaters
D. none of the above
Explanation:
35. For forced draught system, the function of chimney is mainly
A. to produce draught to accelerate the combustion of fuel
B. to discharge gases high up in the atmosphere to avoid hazard
C. to reduce the temperature of the hot gases discharged
D. none of the above
Explanation:
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