The teeth on the surface of spur gears are

• Curved

• Straight

• Inclined

The teeth on the surface of Helical gears are

• Curved

• Straight

• Inclined

Gear which converts rotary motion into linear motion

• Rack & Pinion

• Worm and worm wheel

An example of non parallel & non intersecting gear is

• Spur gear

• Helical gear

• Worm and worm wheel

Gear drives are used for

• Long drives

• Short drives

Gears having peripheral velocity below 3m/s are

• High velocity gear

• Medium velocity gear

• Low velocity gear

Gears used for speed reductions are

• Rack & Pinion

• Worm & Worm wheel

Gears used in compressors are

• Spur gears

• Helical gears

• Bevel gears

Gears having spiral teeth are called as

• Helical gears

• Spur gears

• Spiral gears

Rack & Pinion is an example of

• Internal Meshing

• External Meshing

• Both internal & External meshing