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Machine Design

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

Double
Same
None of these
Half

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Machine Design
A flange coupling is used to connect two shafts

Which are perfectly aligned
Which are not in exact alignment
Whose axes intersect at a small angle
Have lateral misalignment

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Machine Design
Which of the following property is essential for spring materials?

Stiffness
Ductility
Plasticity
Resilience

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Machine Design
In designing a key, it is assumed that the distribution of forces along the length of key

Varies linearly
Varies exponentially, being more at the torque-input end
Is uniform throughout
Varies exponentially, being less at the torque-input end

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Machine Design
When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)

π/4 × d² × tτu
πd.t.τu
π/4 × d².τu
t.τu

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Machine Design
The contact ratio for gears is

None of these
Greater than one
Zero
Less than one

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