Question 189Electricity & Electronics - 1st Asst/Chief

The correct answer is A) wiping with a clean dry cloth. Motor controller contacts should be routinely cleaned by wiping them with a clean, dry cloth. This is the recommended method as it gently removes any buildup or corrosion on the contacts without causing damage. Filing (option B) or using abrasive materials like crocus cloth (option D) can potentially damage the delicate contacts. Blowing with compressed air (option C) may dislodge debris but does not actively clean the contacts. Proper maintenance of motor controller contacts is crucial to ensure reliable and safe operation of electrical systems on vessels, which is an important aspect covered in the US Coast Guard Captain's License Examinations.