Which of the following statements is/are true regarding all day efficiency of a transformer?
(i) All day efficiency is also called as commercial efficiency.
(ii) All day efficiency primarily depends on the duration of load and amount of load.
(iii) All day efficiency is achieved when the iron losses are less.
1
Both (i) and (iii) are true
2
Only (i) is true
3
Only (ii) is true
4
Both (ii) and (iii) are true