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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
In a boiler, the heat is lost

In moisture present in the fuel
All of these
To dry flue gases
To steam formed by combustion of hydrogen per kg of fuel

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

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

Vb = 0.5 V cosα
Vb = V² cosα
Vb = 0.5 V² cosα
Vb = V cosα

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

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

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Steam Boilers, Engines, Nozzles and Turbines
A condenser where circulating water flows through tubes which are surrounded by steam, in known as

Barometric condenser
Surface condenser
Evaporative condenser
Jet condenser

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Steam Boilers, Engines, Nozzles and Turbines
The clearance in the engine cylinder

Increases the mean effective pressure
Decreases the efficiency of the engine
All of these
Increases the workdone

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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