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

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

0.74

0.56

0.78

0.63

0.74

0.56

0.78

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Steam Boilers, Engines, Nozzles and Turbines
The average operating pressure of Benson boiler is

150 bar

200 bar

250 bar

100 bar

150 bar

200 bar

250 bar

100 bar

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Steam Boilers, Engines, Nozzles and Turbines
There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called

Saturated steam

Wet steam

Cushion steam

Superheated steam

Saturated steam

Wet steam

Cushion steam

Superheated steam

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Steam Boilers, Engines, Nozzles and Turbines
The feed check valve is used in order to

Recirculate unwanted feed water

Check level of water in boiler drum

Regulate flow of boiler water

Allow high pressure feed water to flow to drum and not allow reverse flow to take place

Recirculate unwanted feed water

Check level of water in boiler drum

Regulate flow of boiler water

Allow high pressure feed water to flow to drum and not allow reverse flow to take place

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Steam Boilers, Engines, Nozzles and Turbines
The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called

Natural draught

Forced draught

Induced draught

Balanced draught

Natural draught

Forced draught

Induced draught

Balanced draught

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Steam Boilers, Engines, Nozzles and Turbines
The amount of water evaporated from feed water at _________ into dry and saturated steam at 100° C at normal atmospheric pressure is called equivalent evaporation from and at 100° C.

60°C

100°C

0°C

40°C

60°C

100°C

0°C

40°C

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Steam Boilers, Engines, Nozzles and Turbines

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

Steam Boilers, Engines, Nozzles and Turbines The average operating pressure of Benson boiler is

Steam Boilers, Engines, Nozzles and Turbines There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called

Steam Boilers, Engines, Nozzles and Turbines The feed check valve is used in order to

Steam Boilers, Engines, Nozzles and Turbines The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called

Steam Boilers, Engines, Nozzles and Turbines The amount of water evaporated from feed water at _________ into dry and saturated steam at 100° C at normal atmospheric pressure is called equivalent evaporation from and at 100° C.

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

Steam Boilers, Engines, Nozzles and Turbines
The average operating pressure of Benson boiler is

Steam Boilers, Engines, Nozzles and Turbines
There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called

Steam Boilers, Engines, Nozzles and Turbines
The feed check valve is used in order to

Steam Boilers, Engines, Nozzles and Turbines
The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called

Steam Boilers, Engines, Nozzles and Turbines
The amount of water evaporated from feed water at _________ into dry and saturated steam at 100° C at normal atmospheric pressure is called equivalent evaporation from and at 100° C.