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Machine Design

Machine Design
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

3 d
5 d
4 d
2 d

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Machine Design
The form factor of a helical gear __________ with the increase in the helix angle.

Increases
None of these
Remains constant
Decreases

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Machine Design
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

Increases
Decreases
None of these
Remains unchanged

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Machine Design
A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called

Elasticity
Ductility
Malleability
Plasticity

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

Minor diameter
Major diameter
Pitch diameter
None of these

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Machine Design
The ball bearings are provided with a cage

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

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