Steam Boilers, Engines, Nozzles and Turbines
When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as

Forced circulation boiler
Internally fired boiler
Externally fired boiler
Natural circulation boiler

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

Workdone on the blades to the energy supplied to the blades
Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam
None of these

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Steam Boilers, Engines, Nozzles and Turbines
Carbonization of coal is the process of

Binding the pulverized coal into briquettes
Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
Heating wood in a limited supply of air at temperatures below 300°C
Pulverizing coal in inert atmosphere

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Steam Boilers, Engines, Nozzles and Turbines
In recuperative air preheaters, the heat is transferred

From a metal wall from one medium to another
By direct mixing
From heating an intermediate material and then heating the air from this material
Heat is transferred by bleeding some gases from furnace

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