Question

part 9 - mechanical comprehension question 5 of 15 which of the wheels shown in the diagram are rotating in the same direction? a a, b, c, and d b a, b, e, and f c a, b, c, and e d a, b, c, and e click the button or type the letter next to your answer.

Explanation:

1. Belt - Driven (Same Direction): When two wheels are connected by a belt (not crossed), they rotate in the same direction. Wheel A and wheel B are connected by a non - crossed belt, so A and B rotate in the same direction. Wheel B and wheel C are concentric (same shaft), so they rotate in the same direction as B (and thus A).
2. Gear - Driven (Opposite Direction): When two gears are meshed (like D - E and E - F), they rotate in opposite directions. But for the same - direction group: A, B, C have the same direction (A - B non - crossed belt, B - C concentric). Now check E and F: E and F are meshed gears, so opposite. But let's check the options. Option D: A, B, C, E. Wait, no, let's re - analyze. Wait, D and E are meshed (gears), so D and E rotate opposite. B and D: the belt between B and D is crossed, so B and D rotate opposite. But A, B, C: A and B (non - crossed belt, same direction), B and C (concentric, same direction). Now, E is meshed with D (opposite to D), and F is meshed with E (opposite to E). But in option D: A, B, C, E. Wait, maybe my initial gear analysis was wrong. Wait, let's look at the diagram again (from the description). A and B: non - crossed belt (same direction). B and C: same axle (same direction). B and D: crossed belt (opposite direction). D and E: meshed gears (opposite direction to D, so same as B? Wait, no. If B and D are opposite (crossed belt), D and E are opposite (gears), so E is same as B. Then E and F: meshed gears (opposite to E, so opposite to B). So A, B, C (same direction), E is same as B (because D is opposite to B, E is opposite to D, so E is same as B). So A, B, C, E: let's check the options. Option D is "A, B, C, and E". Let's verify the other options:

• Option A: A, B, C, D. But B and D are opposite (crossed belt), so wrong.
• Option B: A, B, E, F. E and F are opposite (gears), so wrong.
• Option C: A, B, C, F. F is opposite to E, and E is same as B, so F is opposite to B, wrong.
• Option D: A, B, C, E. A and B (same), B and C (same), B and D (opposite), D and E (opposite, so E same as B), so A, B, C, E same direction.

Answer:

D. A, B, C, and E