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

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%
If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%

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Machine Design
In cross or regular lay ropes

Direction of twist of wires in strands is opposite to the direction of twist of strands
Wires are not twisted
Direction of twist of wires and strands are same
Wires in two adjacent strands are twisted in opposite direction

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