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Machine Design

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

2K
K/2
K
K/4

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Machine Design
In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways.

135°
90°
180°
160°

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Machine Design
The ultimate strength of steel in tension in comparison to shear is in the ratio of

0.042361111111111
0.12638888888889
0.084027777777778
0.085416666666667

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Machine Design
The rocker arms in internal combustion engines are of__________.

Third type levers
First type levers
Second type levers
None of these

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Machine Design
In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

Increasing the cross-section area of bar
Would depend upon other factors
Decreasing the cross-section area of bar
Remain unaffected with cross-section area

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Machine Design
Which of the following is a permanent fastening?

Bolts
Cotters
Keys
Rivets

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