Question 409Electricity & Electronics - Assistant Engineer

The correct answer is C) Master switch contact 'MS 4' may have defective springs. The explanation is as follows: 1. The winch operates in any of the positions with the master switch in the 'lower' direction, but will not 'hoist' in any of the master switch hoist speed positions. This indicates an issue with the 'hoist' function, which is controlled by the 'MS 4' contact in the master switch. 2. If the 'MS 4' contact has defective springs, it would prevent the winch from engaging the 'hoist' function, while the 'lower' function would still operate correctly, as it is controlled by a different contact. 3. The other options (A, B, and D) are incorrect because they refer to different contacts in the master switch that are not responsible for the specific issue described in the question.