Calculate the twisting moment acting on the shaft which undergoes a torsional shear stress of 21 newtons per square millimeter. The diameter of the shaft is 300 millimeters and the polar moment of inertia of the shaft is 100 (millimeter)⁴.

The efficiency of a riveted joint is __________.

In a helical gear, the helix angle for a single helical gear ranges from _______.

In a screw thread, the nominal diameter represents the _________.

A feather key permits _____________.

Which one is used for obtaining constant velocity ratios?

If the strength of the key and the shaft is equal, then the length of the key will be _________.

Which one is the correct expression for equivalent twisting moment? Here, M is the bending moment and T is the twisting moment

____________ are used to connect two non-parallel or intersecting shafts which are coplanar in nature.

Calculate the solid length of a spring, given that the number of coils in the spring is 10 and the diameter of the spring wire is 2 millimeters.

__________ is fixed at one end and free at the other end.