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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.

Blow off cock
Stop valve
Safety valve
Fusible plug

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Steam Boilers, Engines, Nozzles and Turbines
In a reaction turbine, when steam flows through the fixed blades,

Pressure increases while velocity decreases
Pressure and velocity both decreases
Pressure and velocity both increases
Pressure decreases while velocity increases

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet)

Vb = 0.5 V cosα
Vb = 0.5 V² cosα
Vb = V cos α
Vb = V² cos α

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Steam Boilers, Engines, Nozzles and Turbines
A condenser in a steam power plant

Reduces back pressure of steam
Reduces temperature of exhaust steam
Increases expansion ratio of steam
All of these

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

3 m
1 m
2 m
4 m

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Steam Boilers, Engines, Nozzles and Turbines
The value of diagram factor depends upon

Back pressure
All of these
Initial pressure of steam
Initial conditions of steam

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