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Steam Boilers - Interview Questions and Answers

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111. Equivalent evaporation of water is the evaporation "for a feed water supply at 100�C
A. and its corresponding conversion into dry saturated steam at 100�C and 1.033 kg/cm2
B. and its corresponding conversion into dry steam at desired boiler pressure
C. conversion into steam at atmospheric condition
D. conversion into steam at the same pres-sure at which feed water is supplied
E. none of the above.
Explanation:
112. Water at pressure of 4 kg/cm2 and 160�C temperature when exposed to atmosphere will
A. boil
B. flash i.e. get converted into steam
C. remain as it was
D. cool down
E. none of the above.
Explanation:
113. In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is
A. 40%
B. 25%
C. 50%
D. 80%
E. 90%.
Explanation:
114. Stoichiometric quantity of air is the
A. air present in atmosphere at NTP conditions
B. air required for complete combustion of fuel with no excess air
C. air required for optimum combustion so as to have reasonable excess air
D. air required to convert CO into C02
E. air required to form an explosive mixture.
Explanation:
115. Hygrometery deals with the
A. Hygroscopic substances
B. water vapour in air
C. temperature of air
D. pressure of air
E. density measurement.
Explanation:
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