engineering recuitment BHEL Engineer Trainee Mock Test 2025 Design of Machine Elements Power Screws Self Locking Screw
For a machine to be self sustaining, the relation between ϕ = Angle of friction and α = slope of thread, is
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α = ϕ
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α < ϕ
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α > ϕ
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\(\frac{\alpha }{\phi } = constant\)