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Steam Boilers, Engines, Nozzles and Turbines

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

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

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Steam Boilers, Engines, Nozzles and Turbines
In a throttling process

Steam entropy remains constant
Steam enthalpy remains constant
Steam temperature remains constant
Steam pressure remains constant

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Steam Boilers, Engines, Nozzles and Turbines
In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

0.74
0.63
0.78
0.56

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for initially wet steam is

0.577
0.582
0.546
0.601

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Steam Boilers, Engines, Nozzles and Turbines
The fire tubes in a Locomotive boiler has __________ diameter.

47.5 mm
5.47 mm
4.75 mm
7.45 mm

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Steam Boilers, Engines, Nozzles and Turbines
Clearance ratio is the ratio of

Swept volume to the clearance volume
Clearance volume to the volume at cut-off
Volume at cut-off to the swept volume
Clearance volume to the swept volume

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