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What type of gear mechanism is provided to rotate the turbine generator shaft?

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What type of gear mechanism is provided to rotate the turbine generator shaft?

(a) Mutilated gear mechanism

(b) Ratchet gear mechanism

(c) Barring gear mechanism

(d) Planetary gear mechanism

I have been asked this question in an internship interview.

This interesting question is from Types of Fuels in portion Steam Power Plant of Energy Engineering

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Correct answer is (c) Barring gear mechanism

For explanation I would say: Barring gear is the mechanism provided to rotate the turbine generator shaft at very low speed after unit stoppages. Once the steam inlet valve is closed, the turbine comes down towards standstill.  When it stops completely, there is a tendency for turbine shaft to deflect or bend if allowed to remain in same position for too long.

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