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Machine Design

Machine Design
When two springs are in series (having stiffness K), the equivalent stiffness will be

K
2K
K/2
K/4

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Machine Design
The suitable material for belt used in flour mill is

Rubber
Canvas or cotton duck
Balata gum
Leather

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Machine Design
The crest diameter of a screw thread is same as

Core diameter
Major diameter
Pitch diameter
Minor diameter

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Machine Design
The static tooth load should be __________ the dynamic load.

Less than
Greater than
None of these
Equal to

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Machine Design
When a helical compression spring is cut into halves, the stiffness of the resulting spring will be

Double
One-fourth
Same
One-half

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Machine Design
In order to withstand resistance to wear, the best profile of gear is

20° full depth involute tooth
14½° stub tooth
14½° full depth involute tooth
20° involute stub tooth

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