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

2 τ

τ

τ/2

4 τ

2 τ

τ

τ/2

4 τ

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Machine Design
The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ are equal to 6/(6 + v).

20 m/s

10 m/s

12.5 m/s

15 m/s

20 m/s

10 m/s

12.5 m/s

15 m/s

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Machine Design
The longitudinal stress is __________ of the circumferential stress.

One-half

Double

Three-fourth

Two-third

One-half

Double

Three-fourth

Two-third

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Machine Design
If a material fails below its yield point, failure would be due to

Creep

Sudden loading

Fatigue

Straining

Creep

Sudden loading

Fatigue

Straining

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Machine Design
Failure of a material is called fatigue when it fails

At the elastic limit

Below the yield point

Below the elastic limit

At the yield point

At the elastic limit

Below the yield point

Below the elastic limit

At the yield point

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Machine Design
The value of stress concentration factor depends upon

Material of the part

None of these

Geometry of the part

Material and geometry of the part

Material of the part

None of these

Geometry of the part

Material and geometry of the part

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Machine Design

Machine Design The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ are equal to 6/(6 + v).

Machine Design The longitudinal stress is __________ of the circumferential stress.

Machine Design If a material fails below its yield point, failure would be due to

Machine Design Failure of a material is called fatigue when it fails

Machine Design The value of stress concentration factor depends upon

Machine Design
The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ are equal to 6/(6 + v).

Machine Design
The longitudinal stress is __________ of the circumferential stress.

Machine Design
If a material fails below its yield point, failure would be due to

Machine Design
Failure of a material is called fatigue when it fails

Machine Design
The value of stress concentration factor depends upon