Design bases for sizing cylinders in a compound steam engine Identify valid design bases commonly used for selecting cylinder sizes in compound engines. Choose the most comprehensive answer.

Difficulty: Easy

Equal power developed in each cylinder for uniform turning moment
Equal initial piston loads on all pistons so common sizes of piston rod/connecting rod can be used
Equal temperature drop in each cylinder for thermodynamic economy
All of the above

Correct Answer: All of the above

Explanation:

Concept

Compound engines can be proportioned using different (but valid) criteria, depending on the performance objective.

Common bases

Equal power per cylinder → smoother torque.
Equal initial piston loads → standardisation of mechanical parts.
Equal temperature drops → better thermal efficiency and reduced condensation losses.

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