Classification of gears

What is the purpose of power transmission by gear?

• To transmit and modify torque and rotation over a short distance from an input to an output shaft

• To transmit and modify torque and rotation over a long distance from an input to an output shaft

• To transmit and modify torque and rotation over a short distance from an input to an input shaft

• To transmit and modify torque and rotation over a long distance from an output to an input shaft

How are gears classified according to the type of gears?

• By the position of the shafts

• By the teeth position

• By the type of gears

• By the arrangement according to the relative positions of shaft axes

Which type of gear is used for heavy machinery and is costlier due to manufacturing difficulty?

• Herringbone gears

• Double-helical gears

• Helical gears

• Spur gears

What is the characteristic of spiral bevel gears?

• Used for any two shafts at any angle

• Low speeds and light loads

• Teeth mesh each other by a contact line

• Teeth mesh each other by a contact point

What is the purpose of worm gears?

• To provide high loads and high friction losses

• To provide reversibility of the system

• To provide locking feature as a brake

• To provide good lubrication essential

What is the characteristic of crossed-helical gears?

• Teeth mesh each other by a contact point

• Used for non-parallel and non-intersecting shafts

• High sliding action

• Good lubrication essential

What is the characteristic of spur gears?

• Teeth are inclined to the axis of rotation

• Teeth mesh each other by a contact line

• Produce an axial thrust on the shaft

• Teeth mesh each other by a contact point

What is the characteristic of herringbone gears?

• Left and right inclinations meet at a common apex and groove is eliminated in it

• Low noise and vibration

• Manufacturing difficulty makes them costlier

• Used in heavy machinery

What is the characteristic of spiral bevel gears?

• Teeth mesh each other by a contact point

• Conical gears connecting shafts at right angles

• Teeth vary in cross section through out their length

• Used for any two shafts at any angle

What is the characteristic of crossed-helical gears?

• Low speeds

• Light loads

• High sliding action

• Good lubrication essential