Steam Boilers, Engines, Nozzles and Turbines
The function of a piston in a steam engine is

To guide motion of the piston rod and to prevent it from bending
To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment
None of these
To transfer motion from the piston to the cross-head

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Steam Boilers, Engines, Nozzles and Turbines
A nozzle is said to be a divergent nozzle

When the cross-section of the nozzle increases continuously from entrance to exit
None of these
When the cross-section of the nozzle decreases continuously from entrance to exit
When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit

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Steam Boilers, Engines, Nozzles and Turbines
Degree of reaction is defined as the ratio of

Heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades
Heat drop in moving blades to the heat drop in fixed blades
Heat drop in fixed blades to the heat drop in moving blades
Heat drop in fixed blades plus heat drop in moving blades to the heat drop in moving blades

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