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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Sulphur in coal results in

Facilitating ash precipitation
Spontaneous combustion during coal storage
Corroding air heaters
All of these

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of Cornish boiler varies from

1 to 2 m
0.5 to 1 m
2 to 3 m
1.25 to 2.5 m

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for gases is

0.528
0.546
0.577
0.582

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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

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

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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

Blading efficiency
Gross or stage efficiency
Mechanical efficiency
Nozzle efficiency

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

Nozzle efficiency
Diagram efficiency
Gross efficiency
None of these

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