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Machine Design

Machine Design
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

1 micron
10 microns
0.1 micron
0.01 micron

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Machine Design
Which of the following welded joint is designed for shear strength?

Transverse fillet welded joint
Butt welded joint
All of these
Parallel fillet welded joint

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Machine Design
In thrust bearings, the load acts

In any direction
Perpendicular to the axis of rotation
Along the axis of rotation
Parallel to the axis of rotation

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Machine Design
In a turnbuckle, if one of the rods has left hand threads, then the other rod will have

Right hand threads
Left hand threads
Multiple threads
Pointed threads

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Machine Design
The ball bearings are provided with a cage

To facilitate slipping of balls
To maintain the balls at a fixed distance apart
To prevent the lubricant from flowing out
To reduce friction

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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)

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

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