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Machine Design

Machine Design
The constant factor in case of R10 series of preferred numbers is

1.12
1.06
1.26
1.58

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Machine Design
When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

A combination of bending stress and direct shear stress
Direct shear stress only
Bending stress only
A combination of torsional shear stress and bending

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Machine Design
The ball bearings are, usually, made from

Medium carbon steel
High speed steel
High carbon steel
Low carbon steel

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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

0.4 times
0.8 times
0.6 times
0.7 times

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Machine Design
The notch angle of the Izod impact test specimen is

20°
45°
30°
10°

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Machine Design
Stress concentration factor is defined as the ratio of

Nominal stress to the endurance limit
Nominal stress to the maximum stress
Maximum stress to the nominal stress
Maximum stress to the endurance limit

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