1.)Why excess air is required to burn a fuel completely ?
Ans: Excess air is required to ensure adequate mixing of fuel and air, avoid smoke, minimize slagging in coal burning, and to ensure maximum steam output.
2.)At what pressure and temperature the density of water and steam is same ?
Ans: At 225 kg/cm2 and 74.6° C.
3.)What is meant by quality of steam ?
Ans: It refers to amount of unevaporated moisture in steam. If steam is perfectly dry, it's quality is 100%.
4.) Why the efficiency of superheat Rankine cycle is higher than that of simple Rankine cycle?
Ans: Because the mean temperature of heat addition is higher for superheat cycle.
Ans: Excess air is required to ensure adequate mixing of fuel and air, avoid smoke, minimize slagging in coal burning, and to ensure maximum steam output.
2.)At what pressure and temperature the density of water and steam is same ?
Ans: At 225 kg/cm2 and 74.6° C.
3.)What is meant by quality of steam ?
Ans: It refers to amount of unevaporated moisture in steam. If steam is perfectly dry, it's quality is 100%.
4.) Why the efficiency of superheat Rankine cycle is higher than that of simple Rankine cycle?
Ans: Because the mean temperature of heat addition is higher for superheat cycle.
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