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Steam Nozzles and Turbines
The effect of bleeding is that
it increases the thermodynamic efficiency of the turbine
boiler is supplied with hot water
it decreases the power developed by the turbine
all of the above
Correct Answer:
all of the above
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Steam Nozzles and Turbines
A single stage turbine is not used because it requires large reduction gearing due to very high rotational speed.
Which of the following statement is wrong?
During flow through a nozzle, no heat is supplied or rejected by the steam.
Which of the following statement is correct?
Steam turbines may be classified according to
In a nozzle, the effect of supersaturation is to increase the dryness fraction of steam.
In a nozzle, the effect of supersaturation is to
For a Parson's reaction turbine, if α1 and α2 are fixed blade angles at inlet and exit respectively and β1 and β2 are the moving blade angles at entrance and exit respectively, then
When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle.
The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)
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