Final answer:
Main, scavenge, and transfer ejectors are typically powered by sources like steam or compressed air and are influenced by the application and design needs, such as using a hybrid engine in vehicles.
Step-by-step explanation:
The Main, scavenge, and transfer ejectors are typically powered by steam, compressed air, or another working fluid. These ejectors are often used in various engineering applications, such as in marine engineering for pumping fluids or in the aviation industry as part of a jet engine's fuel system. The choice of energy source for these ejectors depends on the specific application and design requirements of the vehicle or system in question. For example, a commuter vehicle designed by a team might include a hybrid engine that utilizes a combination of battery power and traditional combustion to maximize efficiency.