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Machine Design

Machine Design
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

12
24
18
14

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Machine Design
Pick up wrong statement. Fatigue strength can be increased by

Cold working
Shot peening
Hot working
Grinding and lapping surface

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Machine Design
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

Smaller than
Equal to
Larger than
None of these

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Machine Design
Auto frettage is the method of

Pre-stressing thick cylinders
Increasing the life of thick cylinders
Joining thick cylinders
Calculating stresses in thick cylinders

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Machine Design
The longitudinal stress is __________ of the circumferential stress.

Three-fourth
Two-third
One-half
Double

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Machine Design
The pitch of threads on a Jock nut in comparison to pitch of nut is

Same
Finer
Coarser
Very fine

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