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Machine Design

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

None of these
Third
First
Second

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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

0.65
0.55
0.75
0.45

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Machine Design
The velocity factor for ordinary cut gears operating at velocities up to 12.5 m/s is equal to

3/(3 + v)
4.5/(4.5 + v)
6/(6 + v)
0.75/(0.75 + √v)

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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

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

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Machine Design
When spring index increases, the value of Wahl's stress factor

Increases exponentially
Remains same
Decreases linearly
Increases linearly

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Machine Design
Gear box is used

To increase efficiency of system
To produce torque
To obtain variable speeds
For speed reduction

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