Final answer:
The student's question is about the ENG MODE selector and the conditions for activating continuous ignition, but the provided material on electric generators is not directly related. To answer the question, one must consider the programmed aircraft operational scenarios where continuous ignition is automatically engaged.
Step-by-step explanation:
The student's question refers to the operation of an ENG MODE selector in an aircraft's engine control panel.
However, the provided reference material (23.5 Electric Generators) relates to the principles of electromagnetism and the generation of electromotive force (emf) within a coil rotating in a magnetic field.
As such, the reference material does not directly answer the student's question. To address the question, we must understand that continuous ignition in an aircraft may be activated under certain conditions such as during takeoff and landing, in anticipation of encountering severe turbulence, or when flying through heavy rain or hail that could potentially extinguish the engine flame.
In most aircraft systems, the ENG MODE selector in the 'normal' position may not always engage continuous ignition but is instead configured to activate it under specific operational scenarios as programmed by the aircraft manufacturer.