Steam Boilers, Engines, Nozzles and Turbines
For water, at pressures below atmospheric;

Melting point drops slightly and boiling point drops slightly
Melting point rises markedly and boiling point drops markedly
Melting point rises slightly and boiling point drops markedly
Melting point drops slightly and boiling point drops markedly

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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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