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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
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

640/3 m/s
640 m/s
320/3 m/s
160/3 m/s

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Steam Boilers, Engines, Nozzles and Turbines
Curtis turbine is a

Simple reaction turbine
Pressure compounded turbine
Pressure-velocity compounded turbine
Velocity compounded turbine

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Steam Boilers, Engines, Nozzles and Turbines
By compounding the expansion of steam in two or more cylinders, the ratio of expansion

Decreases
None of these
Increases
Does not change

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Steam Boilers, Engines, Nozzles and Turbines
When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be

Over-damping
None of these
Under-damping
Choked

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Steam Boilers, Engines, Nozzles and Turbines
In order to reduce the rotor speed of an impulse turbine, the method employed is

All of these
Pressure-velocity compounding
Velocity compounding
Pressure compounding

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Steam Boilers, Engines, Nozzles and Turbines
While steam expands in turbines, theoretically the entropy

Behaves unpredictably
Increases
Remains constant
Decreases

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