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GATE 2012 Mechanical Engineering (Core Subjects)

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Multiple Choice

The following are the data for two crossed helical gears used for speed reduction:
Gear I : Pitch circle diameter in the plane of rotation 80 mm and helix angle 300
Gear I : Pitch circle diameter in the plane of rotation 120 mm and helix angle 22.50
If the input speed is 1440 rpm, the output speed in rpm is

  1. 1200
  2. 900
  3. 875
  4. 720
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