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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
A condenser in a steam power plant

Increases expansion ratio of steam
Reduces back pressure of steam
All of these
Reduces temperature of exhaust steam

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

0.577
0.546
0.582
0.601

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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

0.63
0.56
0.74
0.78

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Steam Boilers, Engines, Nozzles and Turbines
Ultimate analysis of fuel is determination of percentage of

Higher calorific value
Fixed carbon, ash, volatile matter, moisture
Lower calorific value
Carbon, hydrogen, nitrogen, sulphur, moisture

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Steam Boilers, Engines, Nozzles and Turbines
The shell diameter and length of locomotive boiler are

1.5 m, 4 m
1.5 m, 6 m
2 m, 4 m
1 m, 4 m

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

Vb = V² cosα
Vb = V cosα
Vb = 0.5 V² cosα
Vb = 0.5 V cosα

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