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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

24
12
18
14

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Machine Design
In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)

1.5 d
2.5 d
1 d
2 d

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Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

70 to 83%
63 to 70%
80 to 90%
45 to 60%

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Machine Design
The endurance limit of a material with finished surface in comparison to rough surface is

Less
More or less depending on quantum of load
More
Same

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Machine Design
The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be

43929
44047
44045
43869

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

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

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