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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Film boiling occurs at

Very high pressures
Atmospheric pressures
Medium pressures
Very low pressure

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the workdone on the blades to the energy supplied to the blades, is called

Gross or stage efficiency
Nozzle efficiency
Mechanical efficiency
Blading efficiency

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Steam Boilers, Engines, Nozzles and Turbines
A steam nozzle converts

Heat energy of steam into kinetic energy
Kinetic energy into heat energy of steam
Heat energy of steam into potential energy
Potential energy into heat energy of steam

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Steam Boilers, Engines, Nozzles and Turbines
The action of steam in a steam turbine is

Neither static nor dynamic
Dynamic
Static
Static and dynamic

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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
In a receiver type compound engine, the high pressure and low pressure cylinders

Have common piston rod
Are set at 90°
Have separate piston rods
Are set in V-arrangement

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