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Steam Boilers, Engines, Nozzles and Turbines

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

None of these
Has no effect on
Decreases
Increases

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Steam Boilers, Engines, Nozzles and Turbines
Cut-off governing of steam engines is a method of controlling the engine output by varying

Pressure of intake steam
Volume of intake steam
All of these
Temperature of intake steam

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Steam Boilers, Engines, Nozzles and Turbines
The shell diameter of a Locomotive boiler is

2 m
1.5 m
1 m
2.5 m

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Steam Boilers, Engines, Nozzles and Turbines
Locomotive type' boiler is

Water wall enclosed furnace type
Vertical tubular fire tube type
Horizontal multi-tubular water tube boiler
Horizontal multi-tubular fire tube type

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Steam Boilers, Engines, Nozzles and Turbines
The impulse turbine rotor efficiency will have a maximum value of 0.5 cos 2α, where α is the nozzle exit flow angle, if the

Blade solidity is 0.65
Blade velocity coefficient is unity
Blades are equiangular and frictionless
Blades are equiangular

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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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