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Machine Design

Machine Design
In a marine flange coupling, the pitch circle diameter of bolts is taken as

1.2 d
1.6 d
2.5 d
2 d

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

2K
K/4
K
K/2

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

τ/2
τ
4 τ
2 τ

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Machine Design
The taper on cotter varies from

1 in 48 to 1 in 24
1 in 32 to 1 in 24
1 in 24 to 1 in 20
1 in 15 to 1 in 10

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Machine Design
In a journal bearing, the load on the bearing is __________ to the axis of the journal.

Parallel
Both A and B
Perpendicular
None of these

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Machine Design
A connecting rod should be

Strong in buckling about X-axis
Any one of the above
Equally strong in buckling about X-axis and Y-axis
Strong in buckling about Y-axis

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