Electrical Engineering MCQs

Page No. 302

Reheat factor is the ratio of_____________?


aisentropic heat drop to useful heat drop


badiabatic heat drop to isentropic heat drop


ccumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop


dNone of These



Deaerative heating is done to_____________?


aheat the water


bheat the air in the water


cremove dissolved gases in the water


dNone of above



Blowing down of boiler water is the process_____________?


ato reduce the boiler pressure


bto increase the steam temperature


cto control the solid concentration in the boiler water by removing some of the concentrated saline water


d none of the above



TravelUng grate stoker can burn coals at the rates of____________?


a 50—75 kg/m per hour


b75—100 kg/m per hour


c100—150 kg/m per hour


d150—200 kg/m2 per hour



Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is______________?


aunderfeed stoker


boverfeed stoker


cany


dNone of above


View Answer overfeed stoker

Example of overfeed type stoker is___________?


achain grate


b spreader


ctravelling grate


dall of the above


View Answer all of the above

Under-feed stokers work best for _________ coals high in volatile matter and with caking tendency?


a anthracite


b lignite


csemibituminous and bituminous


dnone of these



In _________ system fuel from a central pulverizing unit is delivered to a bunker and then to the various burners?


aunit


bcentral


cnone of the above


dNone of these


View Answer central

The amount of air which is supplied for complete combustion is called___________?


aprimary air


bsecondary air


c tertiary air


dNone of these


View Answer secondary air

Bucket elevators are used for___________?


acarrying coal in horizontal direction


bcarrying coal in vertical direction


ccarrying coal in any direction


dNone of these



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