Electrical Engineering MCQs

Page No. 308

The draught in locomotive boilers is produced by_____________?


aforced fan


bchimney


csteam jet


donly motion of locomotive


View Answer steam jet

For forced draught system, the function of chimney is mainly_____________?


ato produce draught to accelerate the combustion of fuel


b to discharge gases high up in the atmosphere to avoid hazard


cto reduce the temperature of the hot gases discharged


dnone of the above



The draught produced by steel chimney as compared to that produced by brick chimney for the same height is_____________?


a less


bmore


csame


dmay be more or less


View Answer more

The draught produced by chimney of given height at given outside temperature___________?


adecreases if the chimney gas temperature increases


b increases if the chimney gas temperature increases


cremains same irrespective of chimney gas temperature


dmay increase or decrease



The draught produced, for a given height of the chimney and given mean temperature of chimney gases_______________?


adecreases with increase in outside air temperature


bincreases with increase in outside air temperature


cremains the same irrespective of outside air temperature


dmay increase or decrease with increase in outside air temperature



In a boiler installation the natural draught is produced_____________?


adue to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in


bdue to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column


c due to the fact that at the chimney top the pressure is more than its environmental pressure


dall of the above



The draught which a chimney produces is called_____________?


ainduced draught


bnatural draught


cforced draught


dbalanced draught


View Answer natural draught

The modern steam turbines are___________?


aimpulse turbines


breaction turbines


cimpulse-reaction turbines


dnone of the above



Economiser is used to heat_____________?


aair


bfeed water


cflue gases


dall above


View Answer feed water

A steam power station requires space______________?


aequal to diesel power station


bmore than diesel power station


cless than diesel power station


dNone of above



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