The maximum efficiency of spiral gears is (where θ = Shaft angle, an

1.	The maximum efficiency of spiral gears is (where θ = Shaft angle, and φ = Friction angle)
A.	sin (θ + φ) + 1/ cos (θ - φ) + 1
B.	cos (θ - φ) + 1/ sin (θ + φ) + 1
C.	cos (θ + φ) + 1/ cos (θ - φ) + 1
D.	cos (θ - φ) + 1/ cos (θ + φ) + 1
Answer» D. cos (θ - φ) + 1/ cos (θ + φ) + 1

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The maximum efficiency of spiral gears is (where θ = Shaft angle, and φ = Friction angle)

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