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NFPA CFPS Exam - 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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Ezekiel
4 months ago
Wait, are we sure it's not the Alternator?
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Erick
4 months ago
I thought it was the Generator at first.
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Lucina
4 months ago
Agreed, the Governor is key for speed control.
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Kimbery
4 months ago
The Governor adjusts fuel input, that's a solid fact!
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Lucia
5 months ago
It's definitely the Governor!
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Yvonne
5 months ago
I definitely recall that the governor is key for maintaining constant speed, but I hope I’m not mixing it up with the alternator.
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Katlyn
5 months ago
I'm a bit confused; I thought the generator also played a role in maintaining speed, but now I'm leaning towards the governor.
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Adell
5 months ago
I remember practicing a similar question about engine components, and I think the governor was mentioned as crucial for speed regulation.
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Melina
5 months ago
I think the governor is the right answer since it controls the engine speed by adjusting fuel input, but I'm not completely sure.
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Marti
6 months ago
I'm a little confused by the wording here. Is the "prime mover" the engine itself? And what's the difference between a generator and an alternator? I'll have to review my notes on this topic before I can decide.
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Elvera
6 months ago
Okay, I've got this. The question is asking about the device that varies the fuel input to the prime mover to maintain a constant speed. That's got to be the governor. I'm confident that's the right answer.
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Mireya
6 months ago
Hmm, I'm a bit unsure about this one. The options seem pretty technical, and I'm not super familiar with the different components of engine-driven power supplies. I'll have to think this through carefully.
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German
6 months ago
This seems like a pretty straightforward question about engine-driven emergency power supplies. I think the key is to focus on the part about maintaining a relatively constant speed throughout the full power output range. That sounds like it's describing a governor.
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Kip
11 months ago
C) Governor. It's like the engine's personal trainer, making sure it doesn't overdo it.
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Mona
10 months ago
D) Alternator
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Jani
10 months ago
C) Governor
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Dorethea
10 months ago
B) Distributor
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Kristofer
10 months ago
A) Generator
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Kimbery
11 months ago
I'm not sure, but I think it's either A) Generator or C) Governor.
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Vicki
12 months ago
The governor, of course. Wouldn't want my engine to go wild and start dancing, would I?
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Derick
10 months ago
Without the governor, the engine could potentially run out of control and cause damage.
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Joesph
11 months ago
It's important for the governor to regulate the fuel input to prevent the engine from running too fast.
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Olga
11 months ago
Yes, the governor is responsible for maintaining a constant speed of the prime mover.
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Jose
12 months ago
I agree with Laquanda, the governor is responsible for maintaining a constant speed.
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Alita
12 months ago
C) Governor! Gotta love a good governor keeping that prime mover in check.
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Cortney
10 months ago
D) Alternator
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Lyla
10 months ago
C) Governor
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Lynelle
11 months ago
B) Distributor
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Sol
11 months ago
A) Generator
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Laquanda
12 months ago
I think the answer is C) Governor.
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