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Machine Design

Machine Design
The railway carriage couplings have

Square threads
Buttress threads
Acme threads
Knuckle threads

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Machine Design
The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.

None of these
Increases
Decreases
Remain same

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Machine Design
Belt slip may occur due to

All of these
Driving pulley too small
Heavy load
Loose belt

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Machine Design
In nitrated parts, the origins of the fatigue cracks will occur at

Within the core
Surface
None of these
Just below the surface

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Machine Design
In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

Decreasing the cross-section area of bar
Remain unaffected with cross-section area
Increasing the cross-section area of bar
Would depend upon other factors

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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
0.6 times
0.4 times
0.8 times

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