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Machine Design

Machine Design
The ratio of endurance limit in shear to the endurance limit in flexure is

0.55
0.5
0.33
0.4

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Machine Design
The number of slots in a 25 mm castle nut is

8
2
6
4

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Machine Design
The objective of 'crowning' of the flat pulleys of belt drive is to

Prevent the belt joint from damaging the belt surface
Increase the belt velocity
Prevent the belt from running off the pulley
Increase the power transmission capacity

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Machine Design
In cylindrical cams, the follower moves

In a direction parallel to the cam axis
Along the cam axis
In a direction perpendicular to the cam axis
In any direction irrespective of cam axis

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Machine Design
In helical gears, the distance between similar faces of adjacent teeth along a helix on the pitch cylinders normal to the teeth, is called

Diametral pitch
Module
Normal pitch
Axial pitch

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Machine Design
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

12 kN/m
30 kN/m
6 kN/m
24 kN/m

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