An universal coupling is a type of __________ coupling.

According to Indian standards, total number of tolerance grades are

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

The application of second type levers is found in

If P₁ is the initial tension due to tightening up the bolt and P₂ is the external load on the bolt, then the resultant load (P) on a bolt may be obtained by using the relation (where a = Ratio of elasticity of connected parts to the elasticity of bolt)