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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Water at pressure of 4 kg/cm² and 160°C temperature when exposed to atmosphere will

Cool down
Remain as it was
Flash i.e. get converted into steam
Boil

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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

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

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following gases has the highest calorific value?

Water gas
Producer gas
Blast furnace gas
Coal gas

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Steam Boilers, Engines, Nozzles and Turbines
Pulverized fuel is used for

More calorific value
Medium sized units
Less radiation loss
Better burning

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio (p₂/p₁) is given by

(p₂/p₁) = [2/(n - 1)] n/(n + 1)
(p₂/p₁) = [(n + 1)/2] n - (1/n)
(p₂/p₁) = [(n - 1)/2] n + (1/n)
(p₂/p₁) = [2/(n + 1)] n/(n-1)

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Steam Boilers, Engines, Nozzles and Turbines
Steam in water tube boiler as compared to fire tube boiler

Can be raised rapidly
Is raised at same rate
Could be raised at fast/slow rate depending on design
Is raised at slower rate

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