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

0.56

0.63

0.74

0.78

0.56

0.63

0.74

0.78

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Steam Boilers, Engines, Nozzles and Turbines
The change in internal energy in steam engines equals to

Work done during compression

Work done during the Rankine cycle

Work done during adiabatic expansion

Change in enthalpy

Work done during compression

Work done during the Rankine cycle

Work done during adiabatic expansion

Change in enthalpy

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Steam Boilers, Engines, Nozzles and Turbines
The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

Remains unchanged

Increases

Decreases

Increases/decreases depending on steam temperature requirements

Remains unchanged

Increases

Decreases

Increases/decreases depending on steam temperature requirements

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Steam Boilers, Engines, Nozzles and Turbines
A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as

Superheater

Fusible plug

Stop valve

Blow off cock

Superheater

Fusible plug

Stop valve

Blow off cock

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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.

100°C

60°C

40°C

0°C

100°C

60°C

40°C

0°C

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Steam Boilers, Engines, Nozzles and Turbines
The heat balance sheet for the boiler shows the

Complete account of heat supplied by 1 kg of dry fuel and the heat consumed

Steam formed by combustion of hydrogen per kg of fuel

Moisture present in the fuel

All of these

Complete account of heat supplied by 1 kg of dry fuel and the heat consumed

Steam formed by combustion of hydrogen per kg of fuel

Moisture present in the fuel

All of these

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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 change in internal energy in steam engines equals to

Steam Boilers, Engines, Nozzles and Turbines The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

Steam Boilers, Engines, Nozzles and Turbines A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as

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 The heat balance sheet for the boiler shows the

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 change in internal energy in steam engines equals to

Steam Boilers, Engines, Nozzles and Turbines
The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

Steam Boilers, Engines, Nozzles and Turbines
A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as

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
The heat balance sheet for the boiler shows the