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Machine Design

Machine Design
Which one of the following is a positive drive?

V-belt drive
Crossed flat belt drive
Rope drive
Chain drive

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Machine Design
Residual stress in materials

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

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Machine Design
When a nut is tightened by placing a washer below it, the bolt will be subjected to following type of loads

Shear
Compression
Tension
Combined loads

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Machine Design
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

Maximum principal stress theory
Maximum distortion energy theory
Maximum strain energy theory
Maximum shear stress theory

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Machine Design
According to Indian standard specifications, plain carbon steel designated by 40C8 contains carbon

None of these
0.35 to 0.45%
0.40 to 0.60%
0.20 to 0.40%

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Machine Design
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

2840 d
1680 d
2080 d
1420 d

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