Which statement about spur gears is correct?

Which statement about spur gears is correct?

• A. Spur gears have straight teeth
• B. Spur gears have curved teeth
• C. Spur gears have beveled teeth
• D. Spur gears have helical teeth

Answer: (A)

Spur gears are defined by teeth that are straight and lie parallel to the gear’s axis. This simple, parallel-to-axis tooth shape makes them the most straightforward and economical option for transmitting power between parallel shafts. They mesh directly, offering high efficiency and a compact form at moderate speeds. However, because all teeth engage at once, they can be noisier at higher speeds. The other descriptions refer to different gear types: curved teeth aren’t characteristic of spur gears, bevel gears use beveled teeth for intersecting shafts, and helical gears have angled teeth to distribute load and reduce noise.

Spur gears are defined by teeth that are straight and lie parallel to the gear’s axis. This simple, parallel-to-axis tooth shape makes them the most straightforward and economical option for transmitting power between parallel shafts. They mesh directly, offering high efficiency and a compact form at moderate speeds. However, because all teeth engage at once, they can be noisier at higher speeds. The other descriptions refer to different gear types: curved teeth aren’t characteristic of spur gears, bevel gears use beveled teeth for intersecting shafts, and helical gears have angled teeth to distribute load and reduce noise.