Question

A toy is shown on the left. When the wheels of this toy rotate, the fan is also required to spin. If one pair of gears is to be used exclusively, which option will make this possible?

• A. Fig A
• B. Fig B
• C. Fig C
• D. Fig D

Hint:

In toy design questions, look for "crown gears" (wheels with teeth on their flat face) when transmitting motion at 90 degrees. They are the industry standard for low-cost, high-tolerance gearboxes.

Answer 1

The Correct Option is C

Step 1: Note the shaft geometry.
The wheel axle is horizontal and the fan shaft is vertical, so the axes are perpendicular.
Step 2: Pick the gear.
Only bevel gears transmit motion between perpendicular shafts.
\[ \boxed{\text{Option 3 (Fig C)}} \]