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Machine Design

Machine Design
In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be

15
21
25
17

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Machine Design
The material commonly used for machine tool bodies is

Mild steel
Aluminium
Brass
Cast iron

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Machine Design
The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be

4 times more
3 times more
Same in both cases
2 times more

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Machine Design
A bench vice has following type of threads

Square
Buttress
Acme
Metric

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Machine Design
In the levers of third type, the mechanical advantage is __________ one.

More than
None of these
Equal to
Less than

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Machine Design
The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

0.45
0.75
0.55
0.65

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