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Machine Design

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

2.5 d
1.2 d
2 d
1.6 d

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Machine Design
A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

7.2 N/mm² compression
3.6 N/mm² compression
7.2 N/mm² tension
3.6 N/mm² tension

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Machine Design
Lewis equation is applied

To stronger of the pinion or gear
Only to the gear
Only to the pinion
To weaker of the pinion or gear

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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

4 τ
τ
2 τ
τ/2

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Machine Design
The cam follower generally used in automobile engines is

Flat faced follower
Knife edge follower
Roller follower
Spherical faced follower

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Machine Design
The shock absorbing capacity of a bolt can be increased by

Tightening it properly
Increasing shank diameter
Grinding the shank
Making shank diameter equal to core diameter of thread

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