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

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

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

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
None of these
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

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

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