371) In order to obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will

remain unaffected

improve

worsen

may improve/worsen depending on size

Answer is:

worsen

unburnt carbon in ash

incomplete combustion

ash content

flue gases

Answer is:

supply of excess, air

supply of excess coal

burning CO and unburnts in upper zone of furnace by supplying more air

fuel bed firing

Answer is:

inherent moisture and surface moisture are different things

in some coals moisture may be present upto 40%

some moisture in coal helps in better burning which is not possible with completely dry coal

it increases thermal efficiency

Answer is:

cavitation of .boiler feed pumps

corrosion caused by oxygen

heat transfer coefficient

pH value of water

Answer is: