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Machine Design

Machine Design
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

0.5
0.2
0.65
0.35

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Machine Design
The pitch diameter is the __________ diameter of an external or internal screw thread.

Smallest
None of these
Largest
Effective

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Machine Design
Lewis equation in gears is used to find the

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

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Machine Design
For longitudinal joint in boilers, the type of joint used is

Butt joint with double cover plate
Lap joint with one ring overlapping the other
Butt joint with single cover plate
Any one of the above

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Machine Design
The endurance limit for a mirror polished material will be __________ as compared to unpolished material.

Less
Same
More
None of these

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Machine Design
If threads on a bolt are left hand, threads on nut will be

Right hand with same pitch
Could be left or right hand
Left hand with same pitch
Right hand with fine pitch

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