Question

For what peripheral speed of the machine is the segmental rim on fabricated spider used?

(a) >120 m per s

(b) <120 m per s

(c) >130 m per s

(d) <130 m per s

I have been asked this question in final exam.

Question is taken from Construction of Hydro-Generators in section Design of Synchronous Machines of Design of Electrical Machines

Answer 1

The correct choice is (d) <130 m per s

To explain I would say: The segmental rim on fabricated spider is used for the machines whose peripheral speed is upto 130 m per s. The advantage is it is easy to transport and assemble at site.