Question

To avoid the possible damage to the wicket gates and turbine runners _________________ is provided.

(a) trash racks

(b) surge chamber

(c) floating boom

(d) racks and trolley arrangement

I got this question in a job interview.

This is a very interesting question from Principal Components of a Hydro Electric Scheme topic in division Hydro Electric Power of Irrigation Engineering

Answer 1

Correct option is (a) trash racks

Easy explanation: Intakes should be provided with trash racks so as to prevent the entry of debris into the penstocks or to prevent choking up of the nozzles of the impulse turbines. Trash racks are made up of thin flat steel bars placed 10 to 30 cm apart and the permissible velocity of water entering these is 0.6 to 1.6 m/s.