When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be

Steam Boilers, Engines, Nozzles and Turbines
When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be

Under-damping

Choked

Over-damping

None of these

Under-damping

Choked

Over-damping

None of these

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

All the fuel burns instantaneously producing high energy release

Fuel burns with less air

Explosion in furnace

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

All the fuel burns instantaneously producing high energy release

Fuel burns with less air

Explosion in furnace

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

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Steam Boilers, Engines, Nozzles and Turbines
During storage, the heating value of coal

Remain constant

May increase or decrease depending upon the method of storage

Decreases

Increases

Remain constant

May increase or decrease depending upon the method of storage

Decreases

Increases

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Steam Boilers, Engines, Nozzles and Turbines
Sulphur in coal results in

Corroding air heaters

Spontaneous combustion during coal storage

All of these

Facilitating ash precipitation

Corroding air heaters

Spontaneous combustion during coal storage

All of these

Facilitating ash precipitation

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Steam Boilers, Engines, Nozzles and Turbines
Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

Conversion into steam at the same pressure at which feed water is supplied

And its corresponding conversion into dry steam at desired boiler pressure

And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm²

Conversion into steam at atmospheric condition

Conversion into steam at the same pressure at which feed water is supplied

And its corresponding conversion into dry steam at desired boiler pressure

And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm²

Conversion into steam at atmospheric condition

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Steam Boilers, Engines, Nozzles and Turbines
Efficiency of Rankine cycle can be increased by

Decreasing initial steam pressure and temperature

Increasing exhaust pressure

Increasing the expansion ratio

Decreasing exhausts pressure

Decreasing initial steam pressure and temperature

Increasing exhaust pressure

Increasing the expansion ratio

Decreasing exhausts pressure

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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be

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

Steam Boilers, Engines, Nozzles and Turbines During storage, the heating value of coal

Steam Boilers, Engines, Nozzles and Turbines Sulphur in coal results in

Steam Boilers, Engines, Nozzles and Turbines Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

Steam Boilers, Engines, Nozzles and Turbines Efficiency of Rankine cycle can be increased by

Steam Boilers, Engines, Nozzles and Turbines
When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be

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

Steam Boilers, Engines, Nozzles and Turbines
During storage, the heating value of coal

Steam Boilers, Engines, Nozzles and Turbines
Sulphur in coal results in

Steam Boilers, Engines, Nozzles and Turbines
Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

Steam Boilers, Engines, Nozzles and Turbines
Efficiency of Rankine cycle can be increased by