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Machine Design

Machine Design
If a spring is cut down into two springs, the stiffness of cut springs will be

Double
None of these
Same
Half

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Machine Design
Screws used for power transmission should have

Very fine threads
Low efficiency
High efficiency
Strong teeth

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Machine Design
If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

0.6
0.5
0.2
0.25

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Machine Design
The helix angle for double helical gears may be made up to

45°
75°
60°
90°

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Machine Design
When two helical springs of equal lengths are arranged to form a cluster spring, then

Only A is correct
Both A and B is correct
Shear stress in each spring will be equal
Load taken by each spring will be half the total load

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Machine Design
A V-belt designated as B 4430 LP has

4430 mm as centre distance between pulleys
4430 mm as diameter of small pulley
4430 mm as nominal pitch length
4430 mm as diameter of large pulley

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