Machine Design
The design of pin of a rocker arm of an I.C. engine is based on

All of these
Bearing failure
Bending failure
Shearing failure

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

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)
The efficiency of Acme (trapezoidal) thread is less than that of a square thread
The efficiency of a self locking screw can not be more than 50%

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