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Machine Design

Machine Design
Taper usually provided on cotter is

1 in 40
1 in 10
1 in 5
1 in 24

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

None of these
Minor diameter
Major diameter
Pitch diameter

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Machine Design
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

0.7 times
0.4 times
0.8 times
0.6 times

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Machine Design
The application of third type levers is found in

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

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Machine Design
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

Gd3/ 8D3n
Gd⁴/ 8D3n
Gd⁴/ 4D3n
Gd⁴/ 8D²n

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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.

10 times
20 times
5 times
15 times

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