[Solved] Critical speed of turbine is

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Q.	Critical speed of turbine is
A.	Same as maximum operating speed
B.	Same as run away speed
C.	The speed equal to synchronous speed of generator
D.	The speed at which shaft will break
E.	The speed at which the number of natural vibrations or natural frequency equals the number of revolutions per minute
Answer» E. The speed at which the number of natural vibrations or natural frequency equals the number of revolutions per minute

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Fluid Mechanics and Hydraulic Machines

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