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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Parson's turbine is a

None of these
Simple impulse turbine
Simple reaction turbine
Impulse-reaction turbine

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Steam Boilers, Engines, Nozzles and Turbines
Over fire burning is the phenomenon of

Supply of excess coal
Supply of excess, air
Burning CO and unburnt in upper zone of furnace by supplying more air
Fuel bed firing

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

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Steam Boilers, Engines, Nozzles and Turbines
The high steam and low water safety valve is used to blow off steam when the

None of these
Water level in the boiler becomes too low
Both (A) and (B)
Steam pressure exceeds the working pressure

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of heat equivalent to brake power to the energy supplied in steam is known as

Overall efficiency
Indicated thermal efficiency
Brake thermal efficiency
Mechanical efficiency

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following boilers is best suited to meet fluctuating demands?

Cochran
Locomotive
Babcock and Wilcox
Lancashire

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