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Machine Design

Machine Design
Fibrous fracture occurs in

Elastic material
Brittle material
Hard material
Ductile material

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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
In a flange coupling, the flanges are coupled together by means of

Bolts and nuts
Headless taper bolts
Studs
None of these

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Machine Design
Which of the following is not correct procedure to increase the fatigue limit?

Surface decarburisation
Under stressing
Shot peening
Cold working

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Machine Design
The taper on cotter varies from

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

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Machine Design
The stress in the bar when the load is applied suddenly is __________ as compared to the stress induced due to gradually applied loads.

Double
Same
Four times
Three times

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