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Steam Boilers - Interview Questions and Answers

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71. Gusset stays in a boiler are provided to
A. prevent the bulging of flat surfaces
B. avoid explosion in furnace
C. prevent leakage of hot flue gases
D. support furnace freely from top
E. prevent atmospheric air leaking into furnace.
Explanation:
72. The behavior of coal in a furnace is determined by
A. the content of sulfur
B. the content of ash and heating value
C. the proximate analysis
D. the exact analysis
E. its type.
Explanation:
73. Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value
A. (1- moisture content)
B. (1 + moisture content)
C. 1 + moisture content
D. 1 - moisture content
E. opt 5
Explanation:
74. Which is not correct statement about effect of sulfur in fuel
A. it has heating value
B. it helps in electrostatic precipitation of ash in flue-gases
C. it leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low
D. it erodes furnace walls
E. none of the above.
Explanation:
75. Caking coals are those which
A. form lumps or masses of coke
B. burn freely
C. show little or no fusing action
D. burn completely
E. do not form ash.
Explanation:
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