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Mechanical Engineering Objective Questions { Power Plant Engineering }

120. With increase in load, convection superheater has
A.Drooping characteristic
B.Linear characterisstic
C.Rising characteristic
D.Flat characteristic
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121. The diameter of fire tubes 'in Cochran boiler is of the order of
A.2 cm
B.6 cm
C.-8 cm
D.12 cm
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122. In a recuperative air preheater, the heat is transferred
A.From a metal wall from one medium to another
B.From heating an itermediate material and then heating the air from this material
C.By direct mixing
D.Heat is transferred by bleeding some gases from furnace
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123. A safety valve in a locomotive starts leaking. The leaking medium will be
B.Dry steam
C.Wet steam
D.Super heated steam
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124. The temperature of flue gases at air heater outlet should be
B.Above dew-point temperature of flue gases
C.Below dew-point temperature of flue gases
D.Less than wet bulb temperature of flue gases
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125. 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
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126. The pressure of reheat steam after passing through reheater compared to inlet condition is
D.May be more or less depending on capacity of reheater
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