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Machine Design

Machine Design
The lead angle of a worm is 22.5°. Its helix angle will be

22.5°
90°
45°
67.5°

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Machine Design
A shaft is subjected to

All of these
Combined bending and shear stresses
Shear stresses
Bending stresses

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Machine Design
In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be

0.98
0.96
0.97
0.99

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

Smallest
Largest
Effective
None of these

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Machine Design
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.

10 times
5 times
20 times
15 times

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Machine Design
In case of pressure vessels having closed ends, the fluid pressure induces

Shear stress
Longitudinal stress
None of these
Circumferential stress

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