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Machine Design

Machine Design
Rankine Gordon formula for buckling is valid for

Long column
Very long column
Short and long column
Short column

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Machine Design
The shear stress in a beam varies from zero at the outer fibers to a maximum at the________.

Upper surface
None of these
Neutral surface
Lower surface

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Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

W/2
W/9
2W/3
8W/9

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Machine Design
A key way lowers

Both the strength and rigidity of the shaft
The strength of the shaft
The rigidity of the shaft
The ductility of the shaft

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Machine Design
The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ are equal to 6/(6 + v).

10 m/s
20 m/s
15 m/s
12.5 m/s

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Machine Design
The yield point in static loading is __________ as compared to fatigue loading.

Higher
Lower
Same
None of these

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