Q. In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is __________ the relative velocity of steam at inlet tip of the blade.

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Q. The velocity of whirl at outlet for an axial discharge turbine is

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Q. 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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Q. In a nozzle, the effect of supersaturation is to increase the dryness fraction of steam.

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Q. In an impulse turbine, steam expands

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Q. In a 50% reaction turbine stage, tangential component of absolute velocity at rotor inlet is 537 m/s and the blade velocity is 454 m/s. The power output in kW of steam will be

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Q. The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as

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Q. Steam turbines may be classified according to

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Q. Which of the following statement is wrong?

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Q. If the critical pressure ratio for steam is 0.546, then the steam is initially

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Q. The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ number of stages are required.

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Q. Which of the following statement is correct?

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Q. In a nozzle, the effect of supersaturation is to

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Q. In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be

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Q. The effect of friction in the nozzle __________ dryness fraction of steam.

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Q. In a reaction turbine when the degree of reaction is zero, then there is

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Q. The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.

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Q. The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)

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Q. 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

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Q. The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.

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