Mathematics · Electrical Drives

The heating time constant for a motor, given that its temperature rises to 60% of its final steady-state value after 30 minutes of operation, is:

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1−30ln(0.4) minutes✓
230ln(0.4) minutes
3−30ln(0.6) minutes
430ln(0.6) minutes

Correct answer

−30ln(0.4) minutes

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The heating time constant for a motor, given that its temperature rises to 60% of its final steady-state value after 30 minutes of operation, is:

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The heating time constant for a motor, given that its temperature rises to 60% of its final steady-state value after 30 minutes of operation, is:

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