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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Desecration of feed water is carried out because it reduces

Corrosion caused by oxygen
Heat transfer coefficient
pH value of water
Cavitation of boiler feed pumps

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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
Blades are equiangular and frictionless

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Steam Boilers, Engines, Nozzles and Turbines
In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of

40 atmospheres
30 atmospheres
20 atmospheres
10 atmospheres

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Steam Boilers, Engines, Nozzles and Turbines
Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value

1 + moisture content
(1 + moisture content)
1 – moisture content
(1- moisture content)

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Steam Boilers, Engines, Nozzles and Turbines
Stage efficiency is also known as

None of these
Nozzle efficiency
Diagram efficiency
Gross efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The purpose of governing in steam turbines is to

Maintain the speed of the turbine
Reduce the effective heat drop
Reheat the steam and improve its quality
Completely balance against end thrust

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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