Steam Boilers, Engines, Nozzles and Turbines
The difference between Cornish boiler and Lancashire boiler is that

Former is water tube type and latter is fire tube type
Former contains one fire tube and latter contains two fire tubes
Former is fire tube type and latter is water tube type boiler
None of the listed here

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

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

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

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

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