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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

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

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Steam Boilers, Engines, Nozzles and Turbines
Lancashire boiler is used where working pressure and power required are

High
Moderate
Low
None of these

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Steam Boilers, Engines, Nozzles and Turbines
Thermal equilibrium means that the flow of steam is

Hyperbolic
Polytropic
Isentropic
Isothermal

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Steam Boilers, Engines, Nozzles and Turbines
The chimney draught varies with

All of these
Height of chimney
Temperature of furnace gases
Climatic conditions

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Steam Boilers, Engines, Nozzles and Turbines
Efficiency of Rankine cycle can be increased by

Increasing exhaust pressure
Decreasing initial steam pressure and temperature
Increasing the expansion ratio
Decreasing exhausts pressure

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Steam Boilers, Engines, Nozzles and Turbines
The friction in the nozzle __________ exit velocity of steam.

Has no effect on
Increases
None of these
Decreases

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