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Machine Design

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

136°
122°
40°
152°

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Machine Design
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.

20 times
5 times
15 times
10 times

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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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Machine Design
The application of third type levers is found in

Handle of a hand pump
A pair of tongs
Lever of a loaded safety valve
Hand wheel of a punching press

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Machine Design
The diameter of knuckle pin in a knuckle joint is usually taken as (where d = Diameter of the rod)

0.5 d
0.8 d
d
1.2 d

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Machine Design
When the bolt is very yielding as compared to the connected members, then the resultant load on the bolt will be equal to the

External load applied
Sum of the initial tension and external load applied
Initial tension
Initial tension or external load, whichever is greater

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