Steam Boilers, Engines, Nozzles and Turbines
For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has

Heating surface depends on other parameters
Equal heating surface
Less heating surface
More heating surface

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

Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam
Workdone on the blades to the energy supplied to the blades
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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