Private Pilot Private Exam

In an electrical system, what is the function of the master switch?

1. To disconnect all avionics systems

2. To provide power to various electrical components

3. To regulate fuel flow electronically

4. To control the thrust of the engines

The correct answer is: To provide power to various electrical components

The function of the master switch in an electrical system is to provide power to various electrical components. When activated, the master switch allows the flow of electrical power from the aircraft's battery and/or alternator to the critical systems that require it, such as lights, radios, and navigation equipment. This central control enables the pilot to manage the entire electrical system efficiently. In contrast, disconnecting all avionics systems would limit power rather than provide it. Regulating fuel flow electronically is a function typically handled by a fuel management system rather than the master switch. Similarly, controlling the thrust of the engines is an aspect related to the throttle or engine control systems, not directly a function of the master switch. Thus, having a comprehensive understanding of the function of the master switch in relation to the electrical system is crucial for pilots to effectively manage aircraft systems.