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

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

4 τ

2 τ

τ

τ/2

4 τ

2 τ

τ

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Machine Design
The width of the pulley should be __________ width of the belt.

Less than

Equal to

None of these

Greater than

Less than

Equal to

None of these

Greater than

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Machine Design
When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the

Initial tension or external load, whichever is greater

Initial tension

External load applied

Sum of the initial tension and external load applied

Initial tension or external load, whichever is greater

Initial tension

External load applied

Sum of the initial tension and external load applied

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Machine Design
The dedendum circle diameter is equal to (where φ = Pressure angle)

Clearance circle diameter × cosφ

Addendum circle diameter × cosφ

Pitch circle diameter × sinφ

Pitch circle diameter × cosφ

Clearance circle diameter × cosφ

Addendum circle diameter × cosφ

Pitch circle diameter × sinφ

Pitch circle diameter × cosφ

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Machine Design
Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?

Gib-head key

Feather key

Woodruff key

Tangent key

Gib-head key

Feather key

Woodruff key

Tangent key

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

2.5

3.5

3.0

2.8

2.5

3.5

3.0

2.8

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Machine Design

Machine Design The width of the pulley should be __________ width of the belt.

Machine Design When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the

Machine Design The dedendum circle diameter is equal to (where φ = Pressure angle)

Machine Design Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?

Machine Design
The width of the pulley should be __________ width of the belt.

Machine Design
When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the

Machine Design
The dedendum circle diameter is equal to (where φ = Pressure angle)

Machine Design
Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?