Machine Design
The elasticity is the property of a material which enables it to

Draw into wires by the application of a tensile force
Resists fracture due to high impact loads
Regains its original shape after deformation when the external forces are removed
Retain deformation produced under load permanently

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Machine Design
Which of the following statement is correct regarding power screws?

The efficiency of a self locking screw can not be more than 50%
The efficiency of Acme (trapezoidal) thread is less than that of a square thread
If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
Both (A) and (B)

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