Which of the following statement is correct for steam turbines as compared to reciprocating steam engines?
A steam nozzle converts
Rateau turbine is
A nozzle is said to be a divergent nozzle
The friction in the nozzle __________ exit velocity of steam.
The pressure of steam, in reaction turbines, is reduced in the fixed blades as well as in moving blades.
The effect of friction on the flow of steam through a nozzle is to
De-Laval turbines are mostly used
The density of supersaturated steam is about __________ that of the ordinary saturated vapour at the corresponding pressure.
The maximum discharge of steam through a convergent-divergent nozzle depends upon
The ratio of the work delivered at the turbine shaft to the heat supplied is called overall thermal efficiency of turbine.
The ratio of the cumulative heat drop to the isentropic heat drop is called reheat factor.
In a reaction turbine
The compounding of turbines is done in order to
A stage, in reaction turbine, is represented by
A single stage turbine is not used because it requires large reduction gearing due to very high rotational speed.
In a nozzle, the effect of supersaturation is to
In pressure compounding of an impulse turbine, the total pressure drop of the steam does not take place in the first nozzle ring, but is divided equally among all the nozzle rings.
The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)
In turbines, the fluid undergoes a continuous steady flow process and the speed of flow is
Which of the following statement is correct?
When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle.
The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.
Degree of reaction is defined as the ratio of
The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.
In velocity compounding of an impulse turbine, the expansion of steam takes place in a nozzle or a set of nozzles from the boiler pressure to condenser pressure.
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)
A nozzle is said to be a convergent-divergent nozzle, when the cross-section of a nozzle first decreases from its entrance to throat and then increases from its throat to exit.
The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ number of stages are required.
In an ideal impulse turbine, the
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