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Machine Design

Machine Design
When a close coiled helical spring is compressed, its wire is subjected to

Tension
All of these
Shear
Compression

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Machine Design
The load cup of a screw jack is made separate from the head of the spindle to

Reduce the value of frictional torque
Enhance the load carrying capacity of the jack
Reduce the effort needed for lifting the working load
Prevent the rotation of load being lifted

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Machine Design
A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by

P/2.s.l
P/√2.s.l
√2P/s.l
2P/s.l

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Machine Design
A screw is said to be over hauling screw, if its efficiency is

Less than 50%
Equal to 50%
More than 50%
None of these

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Machine Design
The sleeve or muff coupling is designed as a

Thick cylinder
Solid shaft
Dun cylinder
Hollow shaft

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Machine Design
When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be

2F/bh
4F/bh
F/bh
3F/2bh

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