Machine Design
Lewis equation in gears is used to find the

Fatigue stress
Shear stress
Tensile stress in bending
Compressive stress in bending

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Machine Design
Which of the following statement is correct regarding power screws?

Both (A) and (B)
If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
The efficiency of Acme (trapezoidal) thread is less than that of a square thread
The efficiency of a self locking screw can not be more than 50%

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