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Mechanical Engineering Objective Questions { Power Plant Engineering }

162. Which is not correct statement about pulverised fuel firing
A.High burning rate is possible
B.Heat release can be easily controlled
C.Fuel burns economically_
D.It is the best technique for burning high ash content fuel haveing low fusion ash
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163. The three "Ts" for good combustion are
A.Temperature, time, and turbulance
B.Total air, true fuel, and turbulance
C.Thorough mixing, total air, and temperature
D.Total air, time, and temperature
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164. Which is not correct statement about the function of furnace
A.To provide proper conditions for continuous complete combustion
B.Mix fuel with air and ignite
C.Separate ash from coal
D.Maintain heat supply to prepare and ignite the incoming fuel
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165. Which is not correct statement about effect of sulphur 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
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166. Gardually increasihg temperature of flue gases at inlet to chimney for given steam outputs is an indication of
A.Higher effectiveness of boiler
B.High calorific value coal being burnt
C.Fouling of heat transfer surfaces
D.Raising of steam temperature
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167. Incomplete combustion can be best judged by
A.Smoky chimney exit
B.Excess air in flue gases
C.Measuring carbon mono-oxide in flue gases
D.Measuring terniteratureof flue gases at exit of furnace
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168. The capacity of induced draft fan corn-pared to forced draft fan in a boiler is
D.Less or more depending on size of boiler
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