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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be

Over-damping
Choked
Under-damping
None of these

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Steam Boilers, Engines, Nozzles and Turbines
Desecration of feed water is carried out because it reduces

Heat transfer coefficient
Cavitation of boiler feed pumps
Corrosion caused by oxygen
pH value of water

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Steam Boilers, Engines, Nozzles and Turbines
The expansion of steam, as it flows over the blades in reaction turbine, represents

Throttling process
Isentropic process
Free expansion process
Isothermal process

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Steam Boilers, Engines, Nozzles and Turbines
Relative percentage of heat absorbed through the heat transfer of(i) Furnace water wall(ii) Boiler tank(iii) Superheater(iv) Economizer(v) Air-heater of a typical boiler of 200 MW capacity would be of the order of

20 : 48 : 7 : 15 : 10
48 : 20 : 15 : 7 : 10
7 : 15 : 20 : 10 : 48
10 : 7 : 15 : 20 : 48

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Steam Boilers, Engines, Nozzles and Turbines
The rate of discharge through the nozzle ___ when the exit pressure is gradually reduced.

None of the listed here
Remains same
Decreases
Increases

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of total useful heat drop to the total isentropic heat drop, is called

Stage efficiency
Rankine efficiency
Internal efficiency
None of these

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