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

0.78

0.56

0.63

0.74

0.78

0.56

0.63

0.74

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Steam Boilers, Engines, Nozzles and Turbines
In fire tube boilers

None of these

The flames and hot gases pass through the tubes which are surrounded by water

Forced circulation takes place

Water passes through the tubes which are surrounded by flames and hot gases

None of these

The flames and hot gases pass through the tubes which are surrounded by water

Forced circulation takes place

Water passes through the tubes which are surrounded by flames and hot gases

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Steam Boilers, Engines, Nozzles and Turbines
Lancashire boiler is of

Natural circulation type

All of the listed here

Horizontal type

Stationary < fire tube type

Natural circulation type

All of the listed here

Horizontal type

Stationary < fire tube type

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

More

Same

None of these

Less

More

Same

None of these

Less

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Steam Boilers, Engines, Nozzles and Turbines
The length of Lancashire boiler varies from

6 to 7 m

7.25 to 9 m

5 to 6 m

9 to 10 m

6 to 7 m

7.25 to 9 m

5 to 6 m

9 to 10 m

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Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine

The pressure and temperature of steam remains constant

The steam is expanded in nozzles only and there is a pressure drop and heat drop

The steam is expanded both in fixed and moving blades continuously

The steam is expanded in moving blades only

The pressure and temperature of steam remains constant

The steam is expanded in nozzles only and there is a pressure drop and heat drop

The steam is expanded both in fixed and moving blades continuously

The steam is expanded in moving blades only

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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 In fire tube boilers

Steam Boilers, Engines, Nozzles and Turbines Lancashire boiler is of

Steam Boilers, Engines, Nozzles and Turbines The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

Steam Boilers, Engines, Nozzles and Turbines The length of Lancashire boiler varies from

Steam Boilers, Engines, Nozzles and Turbines In an impulse turbine

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
In fire tube boilers

Steam Boilers, Engines, Nozzles and Turbines
Lancashire boiler is of

Steam Boilers, Engines, Nozzles and Turbines
The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

Steam Boilers, Engines, Nozzles and Turbines
The length of Lancashire boiler varies from

Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine