Question 398Electricity & Electronics - QMED

70% to pass

As shown in the illustration, what is the functional purpose of the normally closed and normally open auxiliary contacts of the hoist and lower contactors respectively? Illustration EL-0102

Diagram for USCG Electrical QMED: As shown in the illustration, what is the functional purpose of the normally...

Athe normally closed hoist and lower contactor auxiliary contacts are interlock contacts preventing simultaneous pulling in both the hoist and lower contactors and the normally open contacts extend control power to the speed control circuits

Bthe normally closed and normally open hoist and lower contactor auxiliary contacts are interlock contacts preventing simultaneous pulling in both the hoist and lower contactors

Cthe normally open hoist and lower contactor auxiliary contacts are interlock contacts preventing simultaneous pulling in both the hoist and lower contactors and the normally closed auxiliary contacts extend control power to the speed control circuits

Dthe normally closed and normally open hoist and lower contactor auxiliary contacts extend control power to the speed control circuits

AI Explanation

The correct answer is A. The normally closed hoist and lower contactor auxiliary contacts are interlock contacts that prevent the simultaneous pulling in of both the hoist and lower contactors. This ensures that the hoisting and lowering functions are mutually exclusive, preventing potentially dangerous simultaneous operations. The normally open auxiliary contacts extend control power to the speed control circuits, allowing the operator to control the hoist and lower functions independently. The other options are incorrect because they either do not fully explain the purpose of the interlock contacts (B, C) or incorrectly assign the function of the auxiliary contacts (D).