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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Machine Design
The designation M 33 × 2 of a bolt means

Bolt of 33 mm nominal diameter having 2 threads per cm
Metric threads with cross-section of 33 mm
Metric threads of 33 mm outside diameter and 2 mm pitch
Metric threads of 33 numbers in 2 cm

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