A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as

Steam Boilers, Engines, Nozzles and Turbines
A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as

Superheater

Economizer

Injector

Air-preheater

Superheater

Economizer

Injector

Air-preheater

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Steam Boilers, Engines, Nozzles and Turbines
The nozzle efficiency is the ratio of

None of these

Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

Workdone on the blades to the energy supplied to the blades

None of these

Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

Workdone on the blades to the energy supplied to the blades

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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

Explosion in furnace

All the fuel burns instantaneously producing high energy release

Fuel burns with less air

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

Explosion in furnace

All the fuel burns instantaneously producing high energy release

Fuel burns with less air

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Steam Boilers, Engines, Nozzles and Turbines
Water tube boilers are

Externally fired

Internally as well as externally fired

Internally fired

None of these

Externally fired

Internally as well as externally fired

Internally fired

None of these

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Steam Boilers, Engines, Nozzles and Turbines
An air preheater is installed

Before the superheater

Before the economiser

None of these

Between the economiser and chimney

Before the superheater

Before the economiser

None of these

Between the economiser and chimney

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Steam Boilers, Engines, Nozzles and Turbines
De-Laval turbines are mostly used

For small power purposes and low speeds

Where low speeds are required

For large power purposes

For small power purposes and high speeds

For small power purposes and low speeds

Where low speeds are required

For large power purposes

For small power purposes and high speeds

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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as

Steam Boilers, Engines, Nozzles and Turbines The nozzle efficiency is the ratio of

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

Steam Boilers, Engines, Nozzles and Turbines Water tube boilers are

Steam Boilers, Engines, Nozzles and Turbines An air preheater is installed

Steam Boilers, Engines, Nozzles and Turbines De-Laval turbines are mostly used

Steam Boilers, Engines, Nozzles and Turbines
A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as

Steam Boilers, Engines, Nozzles and Turbines
The nozzle efficiency is the ratio of

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

Steam Boilers, Engines, Nozzles and Turbines
Water tube boilers are

Steam Boilers, Engines, Nozzles and Turbines
An air preheater is installed

Steam Boilers, Engines, Nozzles and Turbines
De-Laval turbines are mostly used