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

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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

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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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