Machine Design
A tube has the following advantage over pipe

Lighter and easier to handle
Smoother inside walls
Greater shock absorption
All of these

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

Both (A) and (B)
If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
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

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