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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

V = 44.72 K hd
V = 44.72 K hd
V = 44.72 K hd
V = 44.72 hd K

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Steam Boilers, Engines, Nozzles and Turbines
Stage efficiency is also known as

Nozzle efficiency
Diagram efficiency
None of these
Gross efficiency

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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

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

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Steam Boilers, Engines, Nozzles and Turbines
The economiser is used in boilers to

Economize on fuel
Extract heat from the exhaust flue gases
Increase flue gas temperature
Increase thermal efficiency of boiler

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Steam Boilers, Engines, Nozzles and Turbines
The relative heat absorption for successively added equal areas of boiler convection heating surfaces

Remain unaffected
Decreases
First increases and then decreases
Increases

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Steam Boilers, Engines, Nozzles and Turbines
Vacuum for reciprocating steam engines compared to steam turbines is

Equal
More
Less
Could be more or less depending on the size of plant

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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