Question

The load on a hydel plant varies from a minimum of 10,000 kW to a maximum of 35,000 kW. Two turbo-generators of capacities 20,000 kW each have been installed. Calculate Plant factor.

(a) 50%

(b) 51%

(c) 56.2%

(d) 59.7%

I had been asked this question in an interview for job.

This intriguing question originated from Hydropower in section Hydro Electric Power of Irrigation Engineering

Answer 1

The correct choice is (c) 56.2%

Explanation: Plant factor can be defined as the ratio of the energy actually produced (Average load) to the maximum energy that can be produced at a particular time.

Since two turbo generators are installed, the total installed capacity = 40000 kW

P.F = [(10000 + 35000) / 2] / 40000 = 56%.