Question: 1 . Design a cast iron protective type flange coupling to transmit 1 5 kW at 9 0 0 r . p . m .

1. Design a cast iron protective type flange coupling to transmit 15 kW at 900 r.p.m. from an electric motor to a compressor. The service factor may be assumed as 1.35.
The following permissible stresses may be used :
Shear stress for shaft, bolt and key material =40 MPa
Crushing stress for bolt and key =80 MPa
Shear stress for cast iron =8 MPa Draw a neat sketch of the coupling.

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