Question 99Electricity & Electronics - 1st Asst/Chief

70% to pass

A turbo generator has a rated output of 1200 kW at 60 Hertz, with a no load frequency of 61.5 Hertz. What is its speed droop?

A1.025%
B1.500%
C2.439%
D2.500%
AI Explanation

The correct answer is C) 2.439%. To calculate the speed droop, we use the formula: Speed Droop (%) = (No Load Frequency - Rated Frequency) / Rated Frequency x 100 In this case, the no load frequency is 61.5 Hz and the rated frequency is 60 Hz. Plugging these values into the formula, we get: Speed Droop (%) = (61.5 - 60) / 60 x 100 = 2.439% The other options are incorrect because: A) 1.025% is too low B) 1.500% is too low D) 2.500% is slightly higher than the correct value of 2.439%

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Official Resources
46 CFR Electrical Engineering 46 CFR Machinery & Electrical USCG National Maritime Center
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