The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet)

Steam Boilers, Engines, Nozzles and Turbines
The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet)

Vb = V² cos α

Vb = V cos α

Vb = 0.5 V cosα

Vb = 0.5 V² cosα

Vb = V² cos α

Vb = V cos α

Vb = 0.5 V cosα

Vb = 0.5 V² cosα

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Steam Boilers, Engines, Nozzles and Turbines
Lancashire boiler has __________ internal flue tubes.

One

Four

Two

Three

One

Four

Two

Three

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Steam Boilers, Engines, Nozzles and Turbines
Spontaneous combustion is a phenomenon in which

Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal

Fuel burns with less air

Explosion in furnace

All the fuel burns instantaneously producing high energy release

Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal

Fuel burns with less air

Explosion in furnace

All the fuel burns instantaneously producing high energy release

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Steam Boilers, Engines, Nozzles and Turbines
Tertiary air is the air used to

Cool the scanners

Provide air around burners for obtaining optimum combustion

Transport and dry the coal

Convert CO (formed in lower zone of furnace) into CO₂ at higher zone

Cool the scanners

Provide air around burners for obtaining optimum combustion

Transport and dry the coal

Convert CO (formed in lower zone of furnace) into CO₂ at higher zone

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Steam Boilers, Engines, Nozzles and Turbines
The draught produced by a steam jet issuing from a nozzle placed in the chimney is called

Forced steam jet draught

Chimney draught

None of these

Induced steam jet draught

Forced steam jet draught

Chimney draught

None of these

Induced steam jet draught

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Steam Boilers, Engines, Nozzles and Turbines
The selection of type and size of a steam boiler depends upon

All of these

The power required and working pressure

The geographical position of the power house

The fuel and water available

All of these

The power required and working pressure

The geographical position of the power house

The fuel and water available

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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet)

Steam Boilers, Engines, Nozzles and Turbines Lancashire boiler has __________ internal flue tubes.

Steam Boilers, Engines, Nozzles and Turbines Spontaneous combustion is a phenomenon in which

Steam Boilers, Engines, Nozzles and Turbines Tertiary air is the air used to

Steam Boilers, Engines, Nozzles and Turbines The draught produced by a steam jet issuing from a nozzle placed in the chimney is called

Steam Boilers, Engines, Nozzles and Turbines The selection of type and size of a steam boiler depends upon

Steam Boilers, Engines, Nozzles and Turbines
The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet)

Steam Boilers, Engines, Nozzles and Turbines
Lancashire boiler has __________ internal flue tubes.

Steam Boilers, Engines, Nozzles and Turbines
Spontaneous combustion is a phenomenon in which

Steam Boilers, Engines, Nozzles and Turbines
Tertiary air is the air used to

Steam Boilers, Engines, Nozzles and Turbines
The draught produced by a steam jet issuing from a nozzle placed in the chimney is called

Steam Boilers, Engines, Nozzles and Turbines
The selection of type and size of a steam boiler depends upon