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Machine Design

Machine Design
In standard taper roller bearings, the angle of taper of outer raceway is

25°
15°
5°
8°

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Machine Design
Basic shaft is one

Does not exist
Whose upper deviation is zero
Whose lower as well as upper deviations are zero
Whose lower deviation is zero

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Machine Design
If threads on a bolt are left hand, threads on nut will be

Right hand with same pitch
Right hand with fine pitch
Left hand with same pitch
Could be left or right hand

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Machine Design
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

10 mm
15 mm
25 mm
5 mm

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Machine Design
A shaft is subjected to

Bending stresses
Shear stresses
All of these
Combined bending and shear stresses

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Machine Design
The rated life of a bearing varies

Directly as load
Inversely as cube of load
Inversely as square of load
Inversely as fourth power of load

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