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Steam Boilers, Engines, Nozzles and Turbines

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

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Steam Boilers, Engines, Nozzles and Turbines
An economiser is generally placed between

Induced draft fan and forced draft fan
Last superheater or reheater and air preheater
None of these
Air preheater and chimney

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Steam Boilers, Engines, Nozzles and Turbines
The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is

More
Equal
May be less or more depending on temperature
Less

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the volume at cut-off to the swept volume is called

Expansion ratio
None of these
Cut-off ratio
Clearance ratio

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

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

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Steam Boilers, Engines, Nozzles and Turbines
In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as

100°C and 1.1 bar pressure
50°C and 1.1 bar pressure
100°C and normal atmospheric pressure
50°C and normal atmospheric pressure

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