Question

According to mine regulation, the value of the fleet angle $\theta$, in degree of a drum winder installation lies in the range of

• A. 1.5<$\theta$ $\leq$ 2.0
• B. 0<$\theta$ $\leq$ 1.5
• C. 2.0<$\theta$ $\leq$ 2.5
• D. 2.5<$\theta$ $\leq$ 3.0

Hint:

A smaller fleet angle in drum winders reduces rope wear and ensures safer and more efficient winding operations in mine shafts.

Answer 1

The Correct Option is B

In a drum winder installation, the fleet angle $\theta$ is the angle between the rope and the perpendicular to the drum axis as the rope winds onto the drum. According to standard mining regulations, the fleet angle should be kept small to minimize wear on the rope and ensure smooth winding. The recommended range for the fleet angle in such installations is typically between 0 and 1.5 degrees. Angles larger than this can lead to excessive rope wear and operational inefficiencies. Therefore, the correct range is 0<$\theta$ $\leq$ 1.5 degrees.
Thus, the correct answer is 0<$\theta$ $\leq$ 1.5.