Answer / k.prakashchandra

Whenever there is sudden 'load throw off' ,the rpm of the
turbine increases considerably ,it may even attain run away
speed which may be 5 times the normal(working) rpm

Answer / kj

An alternator cannot be built to run faster that 3000 rpm
if it is to produce 50 Hz. and often is made to run at
1500RPM.

Turbines are not efficient at those low speeds so they are
operated at higher speeds and gearing must be used to
change the speed down to the maximum speed of the
alternator.

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