Question 717Steam Plants - Assistant Engineer
70% to passA steam driven 750 kW turbo-generator has a rated speed of 1200 RPM. The over speed setting for this unit must not exceed _______________.
A1320 RPM
B1380 RPM
C1440 RPM
D1500 RPM
AI Explanation
The correct answer is B) 1380 RPM. The over-speed setting for a steam-driven 750 kW turbo-generator with a rated speed of 1200 RPM must not exceed 1380 RPM. This is based on the general rule that the over-speed setting should be no more than 115% of the rated speed to prevent damage to the generator and associated equipment. The other options are incorrect because: A) 1320 RPM is less than the 115% over-speed limit. C) 1440 RPM and D) 1500 RPM exceed the 115% over-speed limit and would be unsafe for the equipment.
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