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. In a nozzle, the effect of supersaturation is to

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Q. Which of the following statement is correct?

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

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Q. Which of the following statement is wrong?

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Q. Steam turbines may be classified according to

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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. 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. In an impulse turbine, steam expands

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

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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 friction present between the steam and the nozzle surfaces reduces the heat drop by

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Q. An impulse turbine as compared to a reaction turbine, for a given power has __________ row of blades.

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Q. 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.

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Q. When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle.

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Q. In an ideal impulse turbine, the

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Q. During flow through a nozzle, no heat is supplied or rejected by the steam.

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