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Steam Boilers - Interview Questions and Answers

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16. The diameter of fire tubes in Cochran boiler is of the order of
A. 2 cm
B. 6 Cm ,
C. cm
D. 12 cm
E. 15 cm.
Explanation:
17. In forced circulation type boiler
A. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
B. water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
C. feed pump is employed to supplement natural circulation in water wall type furnace
D. water is converted into steam in one pass without any recirculation
E. water is heated in a large number of tubes.
Explanation:
18. The ratio of heat utilised to produce steam and the heat liberated in furnace is known as
A. boiler effectiveness
B. boiler evaporative capacity
C. factor of evaporation
D. equivalent evaporation
E. boiler efficiency.
Explanation:
19. It is required to produce large amount of steam at low pressure. Which boiler should be used ?
A. pulverised fuel fired boiler
B. cochran boiler
C. lancashire boiler
D. babcock and wilcox boiler
E. stoker fired boiler.
Explanation:
20. Steam in water tube boiler as compared to fire tube boiler
A. can be raised rapidly
B. is raised at slower rate
C. is raised at same rate
D. could be raised at fast/slow rate depending on design
E. none of the above is true.
Explanation:
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