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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)

5 d
4 d
3 d
2 d

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Machine Design
The taper on key is given on

Top side only
On both sides
Any side
Bottom side only

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Machine Design
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that

Both the shafts are equally good
Shaft A is better than shaft B
None of these
Shaft B is better than shaft A

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Machine Design
Three different weights fall from a certain height under vacuum. They will take

Same time to reach earth
None of these
Times inversely proportional to weight to reach earth
Times proportional to weight to reach earth

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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.

15 times
5 times
20 times
10 times

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Machine Design
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

Axially downwards
Axially upwards
Axially upwards or downwards
None of these

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