NEIEP Mechanics Practice Exam

Where should the plumb lead of the compensating rope be if the compensating sheave diameter is smaller than the distance between the car and counterweight compensating rope hitches?

1. Machine Side

2. Car Side

3. Counterweight Side

4. Equally from both sides

The correct answer is: Counterweight Side

The plumb lead of the compensating rope should be positioned on the counterweight side when the compensating sheave diameter is smaller than the distance between the car and counterweight compensating rope hitches. This positioning is crucial because it ensures that the compensating force is effectively balanced, maintaining proper alignment and function of the elevator system. Having the plumb lead on the counterweight side will reduce the potential for binding or wear in the system, as the geometry of the setup requires that the rope operates smoothly without additional friction or tension that could arise from improper lead positioning. This alignment also accounts for the relative movements between the car and the counterweight, promoting stability and reliability in the elevator’s operation. Other configurations, such as having the plumb lead on the machine side or car side, would create imbalances or misalignment in the cable path, potentially leading to increased wear and operational inefficiencies.