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Machine Design

Machine Design
In Vickers hardness testing, the pyramid indentor apex is

40°
152°
136°
122°

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Machine Design
In case of pressure vessels having closed ends, the fluid pressure induces

None of these
Longitudinal stress
Circumferential stress
Shear stress

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Machine Design
Gears are casted by

Permanent mould casting
Slush casting
Centrifugal casting
Sand mould casting

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

3.5
2.5
3.0
2.8

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Machine Design
The bearing characteristic number in a hydrodynamic bearing depends upon

Length, width and load
Length, width and speed
Viscosity, speed and load
Viscosity, speed and bearing pressure

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Machine Design
A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.

None of these
Partially
Fully
Either A or B

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