In a textile factory a motor is required to drive the take-up roll on a fabric strip line; the mandrel on which the strip is wound is 0.05 m in diameter and the strip rolls up to a roll 0.25 m in diameter. The strip emerges from the line at a speed of 15 m /s; the strip tension required is 20 kgf. The motor is coupled to the mandrel by a 1:2 reduction gearing. The gears may be considered to be 90% efficient at all speeds. Determine the speed and power rating of the motor needed for this service.

Answer rating: 100% (QA)

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