According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

The cap screws are

 
Failure of a material is called fatigue when it fails

When a helical compression spring is cut into halves, the stiffness of the resulting spring will be

 
The included angle for the British standard whitworth thread is

If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio

According to Indian standards, total number of tolerance grades are

When a bolt is subjected to an external load, the stress induced in the bolt will be

 
The spindles of bench vices are usually provided with knuckle threads.