The
power factor of a spot welding machine is expected to be around
0.3
to 0.5 leading
Unity
0.8
lagging
0.3
to 0.5 lagging
0.3
to 0.5 lagging
Since spot welding
machine operates on high inductive load thus they are having very low lagging
power factor which is around 0.3 to 0.5 lagging.
Since 
is high, so COS is low.
Hence, the correct option is (D).
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