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Mechanical Engineering Objective Questions { Power Plant Engineering }

106. Steam in water tube boiler, as compared to fire tube boiler
A.Can be raised rapidly
B.Is raisd at slower rate
C.Is raised at same rate
D.Could be raised at fast/slow rate depending on design
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107. Thermal efficiency of well maintained boiler will be of the order
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108. Thermal efficiency of a thermal power plant is of the order of
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109. It is required to produce large amount of stearn at low pressure. Which boiler should be used ?
A.Pulverised fuel fu-ed boiler
B.Cochran boiler
C.Lancashire boiler
D.Babcock and wilcox boiler
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110. The overall efficiency of thermal power plant is
A.Boiler efficiency, turhine efficiecny, generator efficieney
B.All the three above plus gas cycle efficiency
C.Carnot cycle efficiency
D.Regenerative cycle efficiency
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111. Which type of boiler can meet rapid changes of load
A.Vertical fire tube type
B.Forced circulation type.
C.Horizontal water tube type
D.Vertical water tube type
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112. 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
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