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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be

160/3 m/s
640 m/s
320/3 m/s
640/3 m/s

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Steam Boilers, Engines, Nozzles and Turbines
When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be

Choked
None of these
Under-damping
Over-damping

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Steam Boilers, Engines, Nozzles and Turbines
Which is not correct statement about pulverized fuel firing?

Heat release can be easily controlled
Fuel burns economically
High burning rate is possible
It is the best technique for burning high ash content fuel having low fusion ash

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Steam Boilers, Engines, Nozzles and Turbines
The pressure of steam in the engine cylinder at the beginning of the stroke is ________ the boiler pressure.

Equal to
None of these
Less than
Higher than

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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
Cut-off ratio
None of these
Clearance ratio

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Steam Boilers, Engines, Nozzles and Turbines
The major axis of elliptical manholes on the shell should be provided

On dished end
Circumferentially
Longitudinally
Anywhere

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