How many igniter plugs per engine are described?

How many igniter plugs per engine are described?

• A. One
• B. Three
• C. Two
• D. Four

Answer: (C)

Ignition reliability is the key idea here. Having two igniter plugs per engine provides redundancy so a failed or fouled plug doesn’t prevent starting. With two plugs, the system can ignite the fuel-air mixture even if one plug isn’t working, and it can place ignition energy in different spots for a more reliable start across varying conditions. A single igniter would be vulnerable to a failure causing a no-start, while more than two adds extra weight and complexity without typical gains in reliability for this setup. So, the described configuration uses two igniter plugs per engine.

Ignition reliability is the key idea here. Having two igniter plugs per engine provides redundancy so a failed or fouled plug doesn’t prevent starting. With two plugs, the system can ignite the fuel-air mixture even if one plug isn’t working, and it can place ignition energy in different spots for a more reliable start across varying conditions. A single igniter would be vulnerable to a failure causing a no-start, while more than two adds extra weight and complexity without typical gains in reliability for this setup. So, the described configuration uses two igniter plugs per engine.