Theory Of Machine MCQ: The maximum efficiency of spiral gears is (where $$\theta $$ = Shaft angle and $$\varphi $$ = Friction angle)

The maximum efficiency of spiral gears is (where $$\theta $$ = Shaft angle and $$\varphi $$ = Friction angle)

Correct Answer: cos(θ+φ)+1 cos(θ−φ)+1

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