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The sun gear in the figure is driven clockwise at 100 rpm. The ring gear is held stationary. For the number of teeth shown on the gears, the arm rotates at
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- 0 rpm
- 20 rpm
- 33.33 rpm
- 666.67 rpm
Correct Option: B
Given: N + y = 0
y = – N
Sun gear means ‘‘3’’
| + y =0 | 30 × 20 |
– 4N – N = 100
– 5N = 100 N = – 20
∴ y = – N = + 20 rpm
