Question 172Electricity & Electronics - Assistant Engineer

The correct answer is D) prevent condensation of moisture. Electric strip heaters are used in motor controllers to prevent the formation of condensation inside the enclosure. Condensation can occur when the temperature inside the enclosure drops below the dew point, causing moisture in the air to condense on the internal components. This can lead to corrosion, short circuits, and other issues that can affect the proper functioning of the motor controller. The electric strip heaters help maintain a slightly elevated temperature within the enclosure, preventing the formation of condensation and ensuring the reliable operation of the motor controller. The other options are incorrect because they do not directly address the primary purpose of the electric strip heaters in this application. Option A is incorrect because the heaters are not used to maintain the components at a specific ambient temperature. Option B is incorrect because the heaters are not used to minimize resistance in internal circuits. Option C is incorrect because the heaters are not specifically used to prevent the freezing of movable contacts.