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Steam Boilers, Engines, Nozzles and Turbines

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

Velocity compounding
All of these
Pressure compounding
Pressure-velocity compounding

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Steam Boilers, Engines, Nozzles and Turbines
An economiser in a boiler

Increases steam pressure
Increases steam flow
Decreases steam pressure
Decreases fuel consumption

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Steam Boilers, Engines, Nozzles and Turbines
The crown of the fire box is made hemispherical in order to

Resist intense heat in fire box
Give maximum space
Give maximum strength
Withstand pressure inside boiler

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Steam Boilers, Engines, Nozzles and Turbines
The steam enters the nozzle at a

Low pressure and a high velocity
High pressure and a high velocity
Low pressure and a low velocity
High pressure and a low velocity

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Steam Boilers, Engines, Nozzles and Turbines
The effect of super-saturation is that the

Exit velocity of steam reduces
Mass of the steam discharged increases
All of these
Entropy and specific volume of the steam increases

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Steam Boilers, Engines, Nozzles and Turbines
The fire tubes in a Cochran boiler usually have _________ diameter.

92.5 mm
72.5 mm
6.25 mm
62.5 mm

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