True or False Gears supplied as assembled are referred to a

True or False

- Gears supplied as assembled are referred to as open gearing.

- The side of a spur gear tooth is called a tooth surface.

- The shape of spur gear teeth is based on an involute form which produces a sliding contact rather than a rolling contact between mating teeth.

- Double helical gear sets use two pair of opposed gear teeth to eliminate thrust load.

- The teeth of herringbone gears join in the middle.

- Hypoid gear shaft axes do not intersect.

- Face gears are used mostly to transmit motion and heavy loads.

- Worm-gear speed reducers are used to obtain speed reduction up to 100:1 with only one set of gears.

- When ordering gears, diametral pitch, tooth size, pitch diameter, gear size, pressure angle, tooth shape, and shaft size should be specified.

- A spur gear is quieter than a helical gear.

- Intermediate gears are sometimes used to make the rotation of two gears the same.

- Worm gears are the most commonly used gear.

Solution

True or False

- Gears supplied as assembled are referred to as open gearing.

False – Open gearing are supplied in parts and assembled at place of installation

- The side of a spur gear tooth is called a tooth surface.

True

- The shape of spur gear teeth is based on an involute form which produces a sliding contact rather than a rolling contact between mating teeth.

False – lnvolute profile provides rolling contacts

- Double helical gear sets use two pair of opposed gear teeth to eliminate thrust load.

True

- The teeth of herringbone gears join in the middle.

True

- Hypoid gear shaft axes do not intersect.

True

- Face gears are used mostly to transmit motion and heavy loads.

True

- Worm-gear speed reducers are used to obtain speed reduction up to 100:1 with only one set of gears.

True

- When ordering gears, diametral pitch, tooth size, pitch diameter, gear size, pressure angle, tooth shape, and shaft size should be specified.

True, however, other parameters like MOC, machining class, service factor, type of gear, any special requirement etc to be also specified.

- A spur gear is quieter than a helical gear.

False – Spur gears make sudden contact whereas helical gears make gradual contact

- Intermediate gears are sometimes used to make the rotation of two gears the same.

True, e.g. idler gear

- Worm gears are the most commonly used gear.

False - Spur gears are used most