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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The numbers of fire tubes in a Cochran boiler are

225
115
75
165

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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 velocity coefficient is unity
Blade solidity is 0.65
Blades are equiangular
Blades are equiangular and frictionless

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Steam Boilers, Engines, Nozzles and Turbines
For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.

Equal
Less
More
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called

Condenser efficiency
Boiler efficiency
Nozzle efficiency
Vacuum efficiency

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

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

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Steam Boilers, Engines, Nozzles and Turbines
When the nozzle operates with the maximum mass flow, the nozzle is said to be

None of these
Choked
Under-damping
Over-damping

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