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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The critical pressure gives the velocity of steam at the throat

More than the velocity of sound
None of these
Equal to the velocity of sound
Less than the velocity of sound

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Steam Boilers, Engines, Nozzles and Turbines
The average value of diagram factor lies between

0.65 to 0.9
0.8 to 1.2
0.2 to 0.5
0.5 to 0.65

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Steam Boilers, Engines, Nozzles and Turbines
The forced circulation of water does not take place in

LaMont boiler
Lancashire boiler
Benson boiler
Velox boiler

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Steam Boilers, Engines, Nozzles and Turbines
In locomotives, the draught is produced by

Both combined (A) and (B)
Steam jet draught
Induced draft fan
Chimney

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Steam Boilers, Engines, Nozzles and Turbines
In a reaction turbine, when steam flows through the fixed blades,

Pressure and velocity both decreases
Pressure decreases while velocity increases
Pressure increases while velocity decreases
Pressure and velocity both increases

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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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