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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The radius of a dished head is taken approximately as

One fourth
Half
Two
One

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Steam Boilers, Engines, Nozzles and Turbines
The length of shell of a Locomotive boiler is

2 m
3 m
4 m
1 m

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Steam Boilers, Engines, Nozzles and Turbines
The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.

10 to 15%
20 to 30%
15 to 20%
30 to 40%

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Steam Boilers, Engines, Nozzles and Turbines
The value of the reheat factor varies from

1.02 to 1.06
1.2 to 1.6
1.08 to 1.10
1.6 to 2

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Steam Boilers, Engines, Nozzles and Turbines
The coal requirement per kW hour generation in the thermal power plant is of the order of

1.0 to 1.5 kg
0.2 to 0.4 kg
0.1 to 0.2 kg
0.6 to 0.8 kg

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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
0.78
0.74
0.56

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