Steam Boilers, Engines, Nozzles and Turbines
In water tube boilers

Water passes through the tubes which are surrounded by flames and hot gases
None of these
Forced circulation takes place
The flames and hot gases pass through the tubes which are surrounded by water

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Steam Boilers, Engines, Nozzles and Turbines
The relative efficiency is defined as the

Ratio of heat equivalent to indicated power to the energy supplied in steam
Ratio of thermal efficiency to Rankine efficiency
Product of thermal efficiency and Rankine efficiency
Ratio of brake power to the indicated power

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