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Steam Nozzles and Turbines

71.

The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine

Answer: B

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72.

For maximum efficiency of an impulse turbine, the steam should leave the blades at right angles to their motion.

Answer: A

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73.

The pressure of steam __________ while flowing through a nozzle.

Answer: B

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74.

The efficiency of steam turbines may be improved by

Answer: D

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75.

The Effect of friction in a nozzle......dryness fraction of steam

Answer: A

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76.

A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be

Answer: C

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77.

The ratio of the useful heat drop to the isentropic heat drop is called

Answer: B

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78.

The turbine blades are

Answer: C

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79.

The impulse turbine rotor efficiency will have a maximum value of 0.5 cos2 α, where α is the nozzle exit flow angle, if the

Answer: C

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80.

 

The maximum velocity attainable at the throat of a steam nozzle is......

Answer: C

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