Machine Design
Lewis equation in gears is used to find the

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

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Machine Design
The angle of twist of shaft is

Inversely proportional to (shaft diameter)²
Directly proportional to (shaft diameter)⁴
Directly proportional to (shaft diameter)²
Inversely proportional to (shaft diameter)⁴

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Machine Design
A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statement is correct?

There are four rivets per pitch length, all in double shear
There are four rivets per pitch length, out of which two are in single shear and two are in double shear
There are five rivets per pitch length, all in double shear
There are five rivets per pitch length, out of which four are in double shear and one is in single shear

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