Steam Boilers, Engines, Nozzles and Turbines
When the speed of the engine is controlled by means of a valve in a steam pipe, which regulates the pressure of steam entering the engine, then the governing is known as

By-pass governing
Cut-off governing
Throttle governing
None of these

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

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

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Steam Boilers, Engines, Nozzles and Turbines
For a Parson's reaction turbine, if α₁ and α₂ are fixed blade angles at inlet and exit respectively and β₁ and β₂ are the moving blade angles at entrance and exit respectively, then

α₁ = β₂ and β₁ = α₂
α₁ = β₁ and α₂= β₂
α₁ < β₁ and α₂ > β₂
α₁ = α₂ and β₁ = β₂

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