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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The best suited coal for chain or traveling grate stoker boiler is

Pulverized coal
High sulphur coal
Non-coking or free burning coal
Coking coal

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Steam Boilers, Engines, Nozzles and Turbines
In order to obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will

Remain unaffected
Improve
Worsen
May improve/worsen depending on size

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Steam Boilers, Engines, Nozzles and Turbines
O₂ content in atmospheric air on volume basis is

0.4
0.23
0.3
0.21

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Steam Boilers, Engines, Nozzles and Turbines
Steam turbines are used for

Electric power generation
All of these
Direct drive of fans, compressors, pumps
Large marine propulsion

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Steam Boilers, Engines, Nozzles and Turbines
The dry saturated steam at very low pressure, (510 kg/cm²) when throttled to atmosphere will become

Dry
Wet
Superheated
Remain dry saturated

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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
0.78
0.63
0.56

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