Mechanical Engineering MCQs

Page No. 3

In a recuperative air preheater, the heat is transferred____________________?


afrom a metal wall from one medium to another


bfrom heating an itermediate material and then heating the air from this material


cby direct mixing ,


dheat is transferred by bleeding some gases from furnace



The temperature of flue gases at air heater outlet should be__________________?


a100°C


babove dew-point temperature of flue gases


cbelow dew-point temperature of flue gases


dless than wet bulb temperature of flue gases



In designing air preheater, the important design consideration is that_________________?


aapproach temperature should be as low as possible


bhandling and maintenance should be easier


cheat transfer area should be optimum


dstack gases should not be cooled to the dew point



The function of injector used in small capacity boilers is to____________________?


acreate vacuum


binject chemical solution in feed pump


cpump water, similar to boiler feed pump


dadd make up water in the system



The height of chimney in a power plant is governed by__________________?


athe draft to be created


blimitation of construction facilities


ccontrol of pollution


dquantity of flue gases to be handled


View Answer control of pollution

Vacuum for reciprocating steam engines compared to steam turbines is__________________?


amore


bequal


cless


dcould be more or less depending on the size of plant


View Answer less

In locomotives, the draught is produced by_________________?


achimney


binduced draft fan


cboth combined A. and B.


dsteam jet draught


View Answer steam jet draught

The maximum discharge through a chimney occurs when the height of chimney is_____________________?


ainfinitely long


baround 200 meters


cequal to the height of the hot gas column producing draught


doutside temperature is very low



Which device is used in thermal power plants to reduce level of pollution___________________?


ainduced draft fan


bsmoke meter


cchimney


dprecipitator


View Answer precipitator

Ultimate analysis of fuel is determination of percentage of____________________?


acarbon, hydrogen, nitrogen, sulphur, moisture


bfixed carbon, ash, volatile matter, moisture


chigher calorific value


dlower calorific value



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