Discussion
The simplest way to reduce the speed of a fixed-speed machine driving a load is
Answer: C
Correct answer: to change the transmission ratio
If the load simply needs to run slower and always at that speed, a pulley or gear change does it at almost no cost and with no loss. The electrical solutions cost money and, in the case of voltage reduction or a fluid coupling, waste power continuously - they earn their place only where the speed must vary.
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