Electrical Engineering MCQs

Page No. 302

Reheat factor is the ratio of_____________?


aisentropic heat drop to useful heat drop

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badiabatic heat drop to isentropic heat drop

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

✓


dNone of These

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Deaerative heating is done to_____________?


aheat the water

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bheat the air in the water

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cremove dissolved gases in the water

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dNone of above

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Blowing down of boiler water is the process_____________?


ato reduce the boiler pressure

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bto increase the steam temperature

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

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d none of the above

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TravelUng grate stoker can burn coals at the rates of____________?


a 50—75 kg/m per hour

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b75—100 kg/m per hour

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c100—150 kg/m per hour

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d150—200 kg/m2 per hour

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


aunderfeed stoker

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boverfeed stoker

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cany

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dNone of above

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View Answer overfeed stoker

Example of overfeed type stoker is___________?


achain grate

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b spreader

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ctravelling grate

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dall of the above

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View Answer all of the above

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


a anthracite

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b lignite

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csemibituminous and bituminous

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dnone of these

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


aunit

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bcentral

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cnone of the above

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dNone of these

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View Answer central

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


aprimary air

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bsecondary air

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c tertiary air

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dNone of these

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View Answer secondary air

Bucket elevators are used for___________?


acarrying coal in horizontal direction

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bcarrying coal in vertical direction

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ccarrying coal in any direction

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dNone of these

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