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Machine Design

Machine Design
The size of a gear is usually specified by

Circular pitch
Pressure angle
Diametral pitch
Pitch circle diameter

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Machine Design
A column of length l is fixed at both ends. The equivalent length of the column is

l
l/2
2 l
l/√2

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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
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that

Both the shafts are equally good
Shaft B is better than shaft A
None of these
Shaft A is better than shaft B

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Machine Design
Stress concentration in cyclic loading is more serious in

Brittle materials
Equally serious in both cases
Depends on other factors
Ductile materials

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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

Sum of the initial tension and external load applied
External load applied
Initial tension
Initial tension or external load, whichever is greater

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