Discussion
An electric drive is preferred to a diesel or steam prime mover mainly because it
Answer: B
Correct answer: is controllable over a wide range with high efficiency
An electric drive can be controlled continuously in speed and torque, in both directions, with quick response and high efficiency, and it can brake electrically and often return the energy. It is also clean at the point of use and quiet. What it cannot do is work without a supply, which is precisely the advantage the diesel prime mover retains and the reason it survives where no supply exists.
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