What characteristic is NOT typical of a salient-pole alternator?

In the context of salient-pole alternators, they are generally characterized by several distinct features. One of the typical characteristics is that they are used in low-speed applications, such as hydroelectric power plants, because of their capability to operate efficiently at lower rotational speeds. The design of these alternators allows for smooth output voltage due to their ability to provide a continuous magnetic field, which minimizes voltage fluctuations during operation.

Furthermore, salient-pole alternators are known for their challenging designs, particularly in balancing the mechanical forces and magnetic fields. This complexity arises from the shape and configuration of the poles, which can lead to design difficulties.

The characteristic not typically associated with a salient-pole alternator is high mechanical stress. These alternators are generally designed to handle the mechanical stresses associated with their operation effectively, thanks to their robust construction and design features that distribute forces evenly. Therefore, the correct answer identifies a characteristic that does not generally apply to salient-pole alternators, emphasizing their strength in managing mechanical requirements rather than succumbing to high stress.