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Machine Design

Machine Design
A locking device extensively used in automobile industry is a

Jam nut
Castle nut
Sawn nut
Ring nut

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Machine Design
In order to withstand resistance to wear, the best profile of gear is

20° involute stub tooth
14½° full depth involute tooth
20° full depth involute tooth
14½° stub tooth

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Machine Design
Which process will increase the fatigue duration of parts?

Finishing and polishing
De-carburisation
Electroplating
Shot-peening

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

2 τ
τ/2
τ
4 τ

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Machine Design
The helix angle for double helical gears may be made up to

45°
60°
75°
90°

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Machine Design
The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.

Heavier
Moderate
None of these
Lighter

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