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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
12
24

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Machine Design
Rankine Gordon formula for buckling is valid for

Short and long column
Short column
Long column
Very long column

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Machine Design
In designing thick cylinders, the equation used is

Birnie's equation
All of these
Clavarinos' equation
Lame's equation

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(8WD/ πd3) × K
(4WD/ πd3) × K
(2WD/ πd3) × K
(WD/ πd3) × K

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Machine Design
The groove angle of pulleys for V-belt is

More than 400
340 to 360
420 to 450
300 to 320

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Machine Design
The root angle of a bevel gear is equal to

Pitch angle + addendum angle
Pitch angle - addendum angle
Pitch angle - dedendum angle
Pitch angle + dedendum angle

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