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Machine Design

Machine Design
Crushing resistance required to crush the rivet per pitch length is

n.d.t.σc
(p - d) t.σc
p.d.σc
p.t.σc

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Machine Design
If two springs are in parallel then their overall stiffness will be

None of these
Double
Same
Half

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Machine Design
A shaft coupling should

Hold the shafts in perfect alignment
All of these
Transmit full power of the shaft
Be easy to connect or disconnect

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Machine Design
Yield point in fatigue loading as compared to static loading is

Lower
Higher
Same
Depends on other factors

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Machine Design
A screw will be self locking, if

Friction angle is equal to helix angle
Friction angle is less than helix angle
Efficiency of screw is 100%
Friction angle is more than helix angle

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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
(T₁ - T₂ + Tc)/2

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