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Machine Design

Machine Design
According to Indian standards, total numbers of tolerance grades are

20
12
8
18

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Machine Design
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be

0.8 d
1.8 d
1.2 d
1.57 d

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Machine Design
A screw is specified by its

Major diameter
Pitch diameter
Minor diameter
Pitch

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Machine Design
The ratio of pitch circle diameter in millimeters to the number of teeth, is called

Circular pitch
Diametral pitch
Module
None of these

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

2.5
3.5
3.0
2.8

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Machine Design
The included angle for the British Association thread is

29°
47.3°
60°
55°

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