Question 717Steam Plants - Assistant Engineer70% to pass
A steam driven 750 kW turbo-generator has a rated speed of 1200 RPM. The over speed setting for this unit must not exceed _______________.
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.
Related Questions
#715 A constant speed hydraulic governor would more than likely be installed on a _______________.#716 Rotating flyweights, acting against a spring force, will provide a simple type of _______________.#718 In any governor there is a small range of speed in which no corrective action occurs. This speed range is called the governor deadband and is caused by _______________.#719 Which steam plant watch operating condition requires priority attention over the other conditions listed? #720 As shown in the illustration bellows "I" in the gland seal regulator is actuated by _______________. Illustration SE-0019