Machine Design
The longitudinal joint in boilers is used to get the required

Diameter of boiler
Length of boiler
Efficiency of boiler
Length and diameter of boiler

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

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