On a Mollier diagram, the expansion of steam through a turbine is graphically represented by________________?
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Answer: B. vertical straight line
Explanation
On a Mollier diagram the ideal expansion of steam through a turbine forms a vertical straight line. A vertical line on this thermodynamic chart represents a constant entropy process known as isentropic expansion. This idealized path indicates maximum possible work extraction without internal frictional irreversibilities. A Mollier diagram plots enthalpy on the vertical axis against specific entropy on the horizontal axis. Isentropic processes assume both adiabatic conditions and complete thermodynamic reversibility during expansion. Real turbines deviate slightly from this vertical path due to internal fluid friction and turbulence.
Power plant engineers use Mollier diagrams to calculate turbine work output and steam condition changes. Comparing actual turbine performance against the ideal vertical line reveals component efficiency losses. Accurate thermodynamic modeling ensures optimal design of steam cycles in large power generating stations. A horizontal straight line on a Mollier diagram would represent a constant enthalpy throttling process. A straight inclined line does not correspond to standard isentropic expansion states on property charts. Curved lines typically represent actual non-isentropic expansions affected by friction and heat losses.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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