A. creep adjustment
B. preliminary light load adjustment
C. full load u.p.f adjustment
D. light load adjustment
I got this question during an interview.
The above asked question is from Electronic Energy Meter, Adjustments in Single Phase Energy meters topic in chapter Measurement of Power and Related Parameters of Electrical Measurements
To explain I would say: Energy meter can be tested for creeping using preliminary light load adjustment. Disc holes are so positioned that they aren’t under the poles of a series magnet.