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

Heat is transferred by bleeding some gas from furnace
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

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Steam Boilers, Engines, Nozzles and Turbines
In an ideal impulse turbine, the

Relative velocity at the inlet of the moving blade is equal to that at the outlet
Axial velocity at inlet is equal to that at the outlet
Absolute velocity at the inlet of moving blade is equal to that at the outlet
Whirl velocity at inlet is equal to that at the outlet

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

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