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Machine Design

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

Smallest
Effective
None of these
Largest

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Machine Design
The shear stress in a beam varies from zero at the outer fibers to a maximum at the________.

Neutral surface
Lower surface
Upper surface
None of these

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Machine Design
The objective of caulking in a riveted joint is to make the joint

Free from stress
Stronger in tension
Leak-proof
Free from corrosion

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Machine Design
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio

Decreases
None of these
Remains unchanged
Increases

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

67.5°
22.5°
45°
90°

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Machine Design
In a horizontal flat belt drive, it is customary to use

Bottom side of belt as slack side
Top side of belt as slack side
None of these
Idler pulley

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