Question

When a double-ended ranging drum shearer cuts coal in a longwall face,

• A. Both the drums rotate in the same direction keeping the front drum up and the rear drum down
• B. Both the drums rotate in the opposite direction keeping the front drum up and the rear drum down
• C. Both the drums rotate in the opposite direction keeping the front drum down and the rear drum up
• D. Both the drums rotate in the same direction keeping the front drum down and the rear drum up

Hint:

In a double-ended shearer, \[ \boxed{ \text{Front drum up, rear drum down, and both drums rotate in opposite directions.} } \]

Answer 1

The Correct Option is B

Step 1: Recall the operation of a double-ended ranging drum shearer. A double-ended ranging drum shearer uses two drums mounted at opposite ends of the machine to cut coal continuously along the longwall face.

Step 2: Identify the drum arrangement. For efficient cutting and loading, \[ \boxed{ \text{The drums rotate in opposite directions, with the front drum up and the rear drum down.} } \] Therefore, \[ \boxed{(B)} \] is the correct answer.