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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
By compounding the expansion of steam in two or more cylinders, the length of stroke

Increases
None of these
Decreases
Does not change

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Steam Boilers, Engines, Nozzles and Turbines
During polytropic process

Steam may be wet, dry or superheated after expansion
All of these
Heat transfer takes place across cylinder walls
Work is done

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Steam Boilers, Engines, Nozzles and Turbines
When the cross-section of a nozzle increases continuously from entrance to exit, it is called a

Divergent nozzle
Convergent-divergent nozzle
None of these
Convergent nozzle

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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
The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as

Injector
Pressure gauge
Feed pump
Feed check valve

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

Medium sized units
More calorific value
Less radiation loss
Better burning

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