Question 137Electricity & Electronics - QMED

The correct answer is B) loose connections or low contact pressure. Explanation: Loose connections or low contact pressure in an operating motor controller can lead to excessive heat or burning contacts. This is because poor electrical connections increase resistance, which in turn generates heat. Loose contacts and low pressure can also cause arcing between the contacts, further contributing to excessive heat and potential damage. The other options are incorrect because: A) A burned-out operating coil would not directly cause excessive heat or burning contacts in the motor controller. C) Low motor starting torque is unrelated to the cause of excessive heat or burning contacts. D) High ambient temperature may exacerbate the issue, but it is not the primary cause of the problem.