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An induction motor when started on load, it does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be _________

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An induction motor when started on load, it does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be _________

(a) Locking

(b) Plumming

(c) Crawling

(d) Cogging

The question was asked in final exam.

Origin of the question is Induction Motor as a Transformer topic in section Induction Machines of Electrical Machines

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Best answer
The correct answer is (c) Crawling

Best explanation: Running stably at low speed around 1/7th of normal motor speed is known as crawling.

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