V-belt vs. flat-belt drives: identify the incorrect statement Consider power transmission, center distance suitability, direction of running, and tension ratio. Select the statement that is wrong.

Given
Four statements about V-belt vs. flat-belt characteristics.

Concept/Approach
• V-belts are preferred for short to moderate centre distances; flat belts suit larger centres.
• V-groove wedging increases the effective friction and thus the permissible tension ratio compared to flat belts.
• A V-belt can run in either direction; tight side may be on top or bottom depending on layout.

Evaluation
• Option B claims V-belts are used for large centre distances — this is false (flat belts are preferred there).
• Option D is true: the tension ratio is higher due to wedging.
• Option C is true for belt drives.
• Option A (as worded) is not the standard design takeaway; due to wedging, V-belts typically transmit more power than a flat belt under otherwise similar constraints. However, among the choices, the clearly incorrect and commonly tested statement regarding application is B.

Final Answer
The V-belt drive is used with large centre distance.