Examkin

Question

Difficulty: MediumGears and Gear Ratios

Match the following types of gear components to their primary mechanical function within a transmission system.

  • Rack and pinion systemConverts rotational motion into linear motion
  • Worm gear driveProvides drastic speed reduction and typically prevents back-driving
  • Bevel gear setChanges the axis of rotation by 90 degrees between intersecting shafts
  • Idler gearReverses the rotational direction without changing the final output speed ratio

Answer

Rack and pinion maps to converting rotational to linear motion. Worm gear maps to providing drastic speed reduction and preventing back-driving. Bevel gear maps to changing the axis of rotation by 90 degrees. Idler gear maps to reversing rotational direction without changing the final output speed ratio.
Each gear type serves a distinct mechanical purpose: rack and pinions handle linear conversion, worm gears manage high reduction and locking, bevel gears handle angular power transmission, and idlers handle direction reversal without ratio changes.

Step-by-Step Solution

1
Identify the unique function of a rack and pinion system.
Matches with converting rotational motion into linear motion.
The circular pinion rolls along the flat rack, pushing it in a straight line, which is unique among these options.
2
Identify the primary characteristic of a worm gear drive.
Matches with providing drastic speed reduction and preventing back-driving.
The screw-like thread of the worm advances the gear by one tooth per revolution, giving high reduction, and friction usually prevents reverse operation.
3
Identify the application of a bevel gear set.
Matches with changing the axis of rotation by 90 degrees between intersecting shafts.
The conical shape of bevel gears allows them to mesh at an angle, most commonly 90 degrees, allowing perpendicular power transmission.
4
Identify the purpose of an idler gear.
Matches with reversing the rotational direction without changing the final output speed ratio.
An intermediate gear only changes the spin direction of the subsequent gear; its tooth count cancels out in the overall ratio calculation.

Key Concept

Functions of specialized gear types in power transmission
Rate this question

Topics

Gears and Gear Ratios

More questions from this topic