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Machine Design

Machine Design
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

12
18
24
14

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Machine Design
A hot short metal is

Ductile at high temperature
Brittle under all conditions
Brittle when cold
Brittle when hot

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Machine Design
The helix angle for single helical gears ranges from

10° to 15°
20° to 35°
35° to 50°
15° to 20°

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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

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

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Machine Design
The included angle for the British Association thread is

60°
29°
55°
47.3°

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Machine Design
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be

W/2A
3W/A
2W/A
W/A

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