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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

14
18
24
12

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Machine Design
The dedendum circle diameter is equal to (where φ = Pressure angle)

Pitch circle diameter × sinφ
Addendum circle diameter × cosφ
Pitch circle diameter × cosφ
Clearance circle diameter × cosφ

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Machine Design
Which is positive drive?

V belt drive
Flat belt drive
Timing belt
Crossed belt drive

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Machine Design
If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited

Acme
Buttress
BSW
Square

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Machine Design
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

Gd3/ 8D3n
Gd⁴/ 4D3n
Gd⁴/ 8D²n
Gd⁴/ 8D3n

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Machine Design
In case of pressure vessels having open ends, the fluid pressure induces

Longitudinal stress
Shear stress
None of these
Circumferential stress

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