Question 100Electricity & Electronics - Assistant Engineer

The correct answer is B) painting or allowing grease build up on the insulated area. The insulated pedestal bearings on electrical generating machines must be kept clean and free of any conductive materials like paint or grease. Allowing these contaminants to build up on the insulated area can create a conductive path, compromising the insulation and potentially leading to electrical shorts or leakage. This practice should be avoided to maintain the proper insulation and operation of the electrical generating machine. The other options are incorrect because: A) touching the bearing shell while the machine is running is generally safe if done carefully, C) using a megohmmeter to check insulation values is a recommended practice, and D) cleaning and removing grease from the insulated area is the correct maintenance procedure, not something to avoid.