1. What is the difference between a low-tension and a high-tension engine ignition system? A. A low-tension system produces relatively low voltage at the spark plug as compared to a hightension system. B. A high-tension system is designed for high-altitude aircraft, while a low-tension system is for low- to medium-altitude aircraft. C. A low-tension system uses a transformer coil near the spark plugs to boost voltage, while the high-tension system voltage is constant from the magneto to the spark plugs.