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NFPA CFPS Exam - Topic 1 Question 9 Discussion

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?
C) Governor
A) Generator
B) Distributor
D) Alternator

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?

Show Suggested Answer Hide Answer
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
7 months ago
Wait, are we sure it's not the Alternator?
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Erick
7 months ago
I thought it was the Generator at first.
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Lucina
7 months ago
Agreed, the Governor is key for speed control.
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Kimbery
7 months ago
The Governor adjusts fuel input, that's a solid fact!
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Lucia
8 months ago
It's definitely the Governor!
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Yvonne
8 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
8 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
8 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
9 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
9 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
9 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
9 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
9 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
1 year ago
C) Governor. It's like the engine's personal trainer, making sure it doesn't overdo it.
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Mona
1 year ago
D) Alternator
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Jani
1 year ago
C) Governor
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Dorethea
1 year ago
B) Distributor
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Kristofer
1 year ago
A) Generator
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Kimbery
1 year ago
I'm not sure, but I think it's either A) Generator or C) Governor.
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Vicki
1 year ago
The governor, of course. Wouldn't want my engine to go wild and start dancing, would I?
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Derick
1 year ago
Without the governor, the engine could potentially run out of control and cause damage.
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Joesph
1 year 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
1 year ago
Yes, the governor is responsible for maintaining a constant speed of the prime mover.
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Jose
1 year ago
I agree with Laquanda, the governor is responsible for maintaining a constant speed.
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Alita
1 year ago
C) Governor! Gotta love a good governor keeping that prime mover in check.
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Cortney
1 year ago
D) Alternator
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Lyla
1 year ago
C) Governor
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Lynelle
1 year ago
B) Distributor
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Sol
1 year ago
A) Generator
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Laquanda
1 year ago
I think the answer is C) Governor.
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