Question

Which of the following machines run at very low speed (<100 rpm):

• A. Turbo generator
• B. Non-salient pole alternator
• C. Salient pole alternator
• D. Water wheel generator

Hint:

Water wheel generators are specially designed to operate at very low speeds due to the nature of the water flow driving them.

Answer 1

The Correct Option is D

The water wheel generator is designed to operate at very low speeds, typically less than 100 rpm. This is because the water wheel itself is driven by the flow of water, which generally operates at low rotational speeds. Other machines like turbo generators, salient pole alternators, and non-salient pole alternators operate at higher speeds in the range of hundreds of rpm. Thus, the correct answer is the water wheel generator, which operates at very low speeds.