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Machine Design

Machine Design
The material commonly used for machine tool bodies is

Cast iron
Mild steel
Aluminium
Brass

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Machine Design
The ultimate strength of steel in tension in comparison to shear is in the ratio of

0.042361111111111
0.12638888888889
0.084027777777778
0.085416666666667

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Machine Design
If a load W is applied instantaneously on a bar; Then the stress induced in bar will

Depend on other considerations
Increase with increase in y
Be independent of ratio of mass of load W to mass of bar (y)
Decrease with decrease in y

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

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Machine Design
Residual stress in materials

Becomes zero when external load is removed
Acts when external load is applied
Is always harmful
Is independent of external loads

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Machine Design
The largest diameter of an external or internal screw thread is known as

Pitch diameter
Minor diameter
Major diameter
None of these

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