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in Physics by (81.6k points)

The insulation resistance of a DC motor is observed to be 15 MΩ at a temp. of 70°C. 

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What is its value corrected to 40°C. the correction factor for 70°C is 8.0.

Observed resistance at 70°C – 15 MΩ. 

Temperature correction factor – 8.

Rm = kt * Rt kt – correction factor. 

Rm = 8 * 15 Rt – resistance measured at +°C. 

Rm = 120 MΩ. Rm – corrected value to 40°C 

The IR of DC motor corrected to 40°C is 120 MΩ

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