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NFPA Exam CFPS Topic 1 Question 9 Discussion

Actual exam question for NFPA's CFPS exam
Question #: 9
Topic #: 1
[All CFPS Questions]

For engine driven emergency power supplies, which of the following devices maintains a relatively constant speed of the prime mover throughout the full power output range by varying the fuel input to the prime mover?

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Suggested Answer: C

. Governor

For engine driven emergency power supplies, the device that maintains a relatively constant speed of the prime mover throughout the full power output range by varying the fuel input to the prime mover is the governor. A governor is a device that automatically regulates the speed or power of an engine or other prime mover by adjusting the amount of fuel supplied to it. A governor senses the speed of the prime mover and compares it with a desired set point, and then controls the fuel valve to increase or decrease the fuel flow accordingly. By doing so, the governor ensures that the prime mover operates within a narrow range of speed or power, regardless of the load or other factors that may affect its performance12


by Valda at Apr 04, 2025, 08:48 AM

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