For reliable generator operation, what are two critical elements of the prime mover? (Choose two.)

Question

Options

• AAir filter
• BFuel filter
• CNoise filter
• DHarmonic filter

• A
  75% (30)
• B
  3% (1)
• C
  8% (3)
• D
  15% (6)

Explanation

Looking at the question, the "choose two" framing and the subject matter point to both A (Air filter) and B (Fuel filter) as the correct answers - the answer key appears to have only shown the first letter.

Both air filter and fuel filter are critical to prime mover operation because the prime mover is an internal combustion engine (diesel or gas) that must draw in clean air and receive uncontaminated fuel to combust reliably and sustain generator output. A clogged air filter starves the engine of oxygen, causing rough running or shutdown, while a dirty or blocked fuel filter restricts fuel flow, leading to misfires, power loss, or complete engine failure. Options C (Noise filter) and D (Harmonic filter) are electrical filtering components used in signal or power conditioning - they have no role in the mechanical prime mover itself. Option C suppresses electromagnetic interference, and Option D reduces waveform distortion in AC power, making both irrelevant to engine reliability.

Memory tip: Think of the prime mover as any combustion engine - it needs two things to run: air and fuel. The two filters that protect those two inputs (air filter, fuel filter) are the critical ones.

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