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Machine Design

Machine Design
In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be

21
17
15
25

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Machine Design
A shaft coupling should

Hold the shafts in perfect alignment
Transmit full power of the shaft
All of these
Be easy to connect or disconnect

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

2W/3
W/2
8W/9
W/9

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Machine Design
A flange coupling is used to connect two shafts

Which are perfectly aligned
Which are not in exact alignment
Whose axes intersect at a small angle
Have lateral misalignment

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Machine Design
Crushing resistance required to crush the rivet per pitch length is

p.t.σc
(p - d) t.σc
n.d.t.σc
p.d.σc

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

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

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