General Studies · Design of Machine Elements
Which of the following equations is valid for the maximum efficiency of a square threaded screw? [where α = Helix angle, φ = Friction angle]
- 1α = (90° − φ)
- 2φ = (90° + α)
- 3α = 45° − φ2✓
- 4φ = 45° − α2
Correct answer
α = 45° − φ2
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