Open circuit characteristics (OCC) is generally drawn across __________
(a) Ea vs If, Ia=constant (not equal to rated)
(b) Ea vs If, Ia=0
(c) Ea vs If, Ia=constant
(d) Ea vs If, Ia=constant (rated)
I got this question during an interview for a job.
My question is based upon No Load with On Load Characteristics of DC Generator topic in section DC Generator of DC Machines