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Steam Boilers - Interview Questions and Answers

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46. If xx and x2 be the dryess fractions obtained in separating calorimeter and throttling calorimeter respectively, then the actual dryness fraction of steam will be
A. xxx2
B. x, + x2
C. xxx2
D. The specific heat of superheated steam in kcal/kg is generally of the order of
E. opt 5
Explanation:
47. Primary air is the air used to
A. provide air around burners for obtaining optimum combustion
B. transport and dry the coal
C. convert CO (formed in lower zone of furnace) into C02 at higher zone
D. air delivered by forced draft fan
E. none of the above.
Explanation:
48. 02 content in atmospheric air on volume basis is
A. 21%
B. 23%
C. 30%
D. 40%
E. 70%.
Explanation:
49. In locomotives, the drought is produced by
A. chimney
B. induced draft fan
C. both combined (a) and (b)
D. steam jet drought
E. none of the above.
Explanation:
50. In designing air preheater, the important design consideration is that
A. approach temperature should be as low as possible
B. handling and maintenance should be easier
C. heat transfer area should be optimum
D. stack gases should not be cooled to the dew point
E. none of the above.
Explanation:
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