Discussion
An induction machine's rated speed is quoted at
Answer: A
Correct answer: full load, a few per cent below synchronous
The nameplate quotes what the machine does at its rated output, which is a few per cent below synchronous speed. Unloaded it runs almost exactly at synchronous, so a machine marked 1,440 rpm will be found turning at something close to 1,498 on no load - which is not a fault.
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