Machine Design
A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)

Equal to inside diameter of pipe
Greater than 30d
Between 20d and 30d
Less than 20d

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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%
Both (A) and (B)
The efficiency of Acme (trapezoidal) thread is less than that of a square thread

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