किस प्रकार के गियर में दांत सीधे और घूर्णन अक्ष के समानांतर होते हैं?

The circle passing through the bottom of the teeth of a gear is known as the:

Which type of gear is called a Double Helical Gear, with teeth arranged in a V-shape along the axis?

In a rack and pinion gear mechanism, the rack typically refers to which of the following component structures?