Machine Design
Which of the following screw thread is used for power transmission in one direction only?

Square threads
Multiple threads
Acme threads
Buttress threads

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Machine Design
A bolt of M 24 × 2 means that

Cross-sectional area of the threads is 24 mm²
The nominal diameter of bolt is 24 mm and pitch is 2 mm
The pitch of the thread is 24 mm and depth is 2 mm
The effective diameter of bolt is 24 mm and there are 2 threads per cm

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