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these engines are self-started,less vibration due to rotary type,involves use of cheaper fuels,high starting torque is required.

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It's true that an external combustion engine such as steam-engine can use cheaper or more or less any fuel; but the other qualities are not so,

A steam turbine (external combustion) can (and must) run without vibration, but so must a gas-turbine (internal combustion). Otherwise the internal combustion engine is the more efficient because its heat losses are much lower. Really, the i.c. engine has the advantage over the e.c., as it is more efficient (less fuel energy per HP or kW output), simpler in principle, lighter overall, cheaper and easier to make.

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