Question 401Electricity & Electronics - QMED

The correct answer is B) Contactors 'L', '1A', '2A' and '3A' pull in. When the '4th point lower' is selected on the winch hoist controller, this engages the lower speed/torque mode of the winch. In this mode, the 'L' contactor pulls in, which activates the lower speed/torque winch circuit. The '1A', '2A' and '3A' contactors also pull in to complete the lower speed/torque control circuit. The other answer choices are incorrect because they do not accurately describe the specific changes that occur when the '4th point lower' is selected. For example, option A describes contactors dropping out, which is not the case in the lower speed/torque mode. Options C and D describe changes to the master switch contacts, which are not directly relevant to the winch hoist controller operation.