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Machine Design

Machine Design
The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be

44045
43869
43929
44047

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Machine Design
The following type of nut is used with alien bolt

Any one of the above
Hexagonal nut
Castle nut
Slotted nut

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Machine Design
A screw will be self locking, if

Friction angle is less than helix angle
Friction angle is equal to helix angle
Friction angle is more than helix angle
Efficiency of screw is 100%

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

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

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Machine Design
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

p/ZN
Z/pN
ZN/p
N/Zp

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Machine Design
The ball bearings are provided with a cage

To facilitate slipping of balls
To prevent the lubricant from flowing out
To reduce friction
To maintain the balls at a fixed distance apart

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