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

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

3

2.5

2.8

3.5

3

2.5

2.8

3.5

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Machine Design
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

Increasing the length of bar

All of these

Decreasing the modulus of elasticity of the bar

Decreasing the cross-sectional area of the bar

Increasing the length of bar

All of these

Decreasing the modulus of elasticity of the bar

Decreasing the cross-sectional area of the bar

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Machine Design
The coefficient of friction in belt drive depends upon

Material of pulley

Belt velocity

Material of belt

Materials of belt and pulley

Material of pulley

Belt velocity

Material of belt

Materials of belt and pulley

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Machine Design
For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)

4μ sinθ/(θ + sinθ)

μ sinθ/(2θ + sin 2θ)

2μ sinθ/(θ + sinθ)

4μ sinθ/(2θ + sin 2θ)

4μ sinθ/(θ + sinθ)

μ sinθ/(2θ + sin 2θ)

2μ sinθ/(θ + sinθ)

4μ sinθ/(2θ + sin 2θ)

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Machine Design
The fatigue life of a part can be improved by

Polishing

Shot peening

Coating

Electroplating

Polishing

Shot peening

Coating

Electroplating

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Machine Design
Which is correct statement? Stress concentration in cyclic loading is

Seriousness would depend on other factors

Very serious in brittle materials and less serious in ductile materials

Very serious in ductile materials and less serious in brittle materials

Equally serious in both types of materials

Seriousness would depend on other factors

Very serious in brittle materials and less serious in ductile materials

Very serious in ductile materials and less serious in brittle materials

Equally serious in both types of materials

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Machine Design

Machine Design An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

Machine Design The coefficient of friction in belt drive depends upon

Machine Design For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)

Machine Design The fatigue life of a part can be improved by

Machine Design Which is correct statement? Stress concentration in cyclic loading is

Machine Design
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

Machine Design
The coefficient of friction in belt drive depends upon

Machine Design
For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)

Machine Design
The fatigue life of a part can be improved by

Machine Design
Which is correct statement? Stress concentration in cyclic loading is