Discussion
An overspeed test on a machine is carried out at
Answer: B
Correct answer: a stated percentage above rated speed for a short period
The overspeed test - commonly 120 per cent of rated speed for two minutes - proves the mechanical integrity of the rotor against centrifugal stress with a margin over any speed it could reach in service. Since centrifugal force goes as the square of speed, 120 per cent applies 44 per cent more stress than rated running.
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