The turbine main casing provides mounting for which stages?

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Multiple Choice

The turbine main casing provides mounting for which stages?

Explanation:
In a multi-stage turbine, the outer main casing acts as the mounting frame for the later stages. The first stage is integrated with the rotor and supported by the inner frame and bearings, so its stationary components are not mounted to the main casing. The subsequent stages rely on the main casing to support their stationary vanes and alignment, which is why the casing provides mounting for the second, third, and fourth stages.

In a multi-stage turbine, the outer main casing acts as the mounting frame for the later stages. The first stage is integrated with the rotor and supported by the inner frame and bearings, so its stationary components are not mounted to the main casing. The subsequent stages rely on the main casing to support their stationary vanes and alignment, which is why the casing provides mounting for the second, third, and fourth stages.

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