Multiple choice

Directions: Carry One Mark Each.

A gear train is made up of five spur gears, as shown in the figure. Gear 2 is driver and gear 6 is driven member. N2, N3, N4, N5 and N6 represent number of teeth on gears 2, 3, 4, 5 and 6, respectively. Which of the following gears act(s) as idler(s)?

  1. Only 3

  2. Only 4

  3. Only 5

  4. Both 3 and 5
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a simple gear train, all odd numbered gears move in one direction and all even numbered gears move in opposite direction. Intermediate gears have no effect on the speed ratio and therefore, they are known as idlers. For the given configuration of gear train, gear 5 is idle gear because it has no effect on speed ratio between gears 4 and 6, except direction manipulation.

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