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Machine Design

Machine Design
Tensile strength of a mild steel specimen can be roughly predicted from following hardness test

Rockwell
Brinell
Vickers
None of these

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Machine Design
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

8F/ πd²
16F/ 3πd²
4F/ πd²
6F/ πd²

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Machine Design
If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

0.6
0.25
0.2
0.5

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Machine Design
Idler pulley is used for

Increasing velocity ratio
For applying tension
All of these
Changing the direction of motion of belt

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Machine Design
If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to

(T₁ - T₂ + Tc)/2
T₁ - T₂ + Tc
(T₁ + T₂ + Tc)/2
T₁ + T₂ + Tc

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

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