1. For constant velocity ratio transmission between two gears, the common normal at the point of contact must always pass through a fixed point on the line joining the centres of rotation of the gears. |
2. For involute gears the pressure angle changes with change in centre distance between gears. |
3. The velocity ratio of compound gear train depends upon the number of teeth of the input and output gears only. |
4. Epicyclic gear trains involve rotation of at least one gear axis about some other gear axis. |
A) 1, 2 and 3
B) 1 and 3
C) 1, 2 and 4
D) 2, 3 and 4
Correct Answer: C
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