Machine Design
In cyclic loading, stress concentration is more serious in

Elastic materials
Brittle as well as ductile materials
Ductile materials
Brittle materials

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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%
If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
The efficiency of Acme (trapezoidal) thread is less than that of a square thread
Both (A) and (B)

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