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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The cylindrical shell of a Lancashire boiler has diameter from

1.75 to 2.75 m
1 to 2 m
1.25 to 2.25 m
1.5 to 2.5 m

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Steam Boilers, Engines, Nozzles and Turbines
A single acting steam engine produces ___ power than that of double acting steam engine.

Half
Double
Four times
Equal

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

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

Efficiency of the chimney
Efficiency of the fan
Efficiency of the boiler
Power of the boiler

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Steam Boilers, Engines, Nozzles and Turbines
The friction present between the steam and the nozzle surfaces reduces the heat drop by

25 to 40%
40 to 60%
15 to 25%
10 to 15%

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Steam Boilers, Engines, Nozzles and Turbines
The pressure of steam __________ while flowing through a nozzle.

Decreases
Increases
None of these
Remains constant

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