The Power factor of a spot welding machine is expected to be around 

The Power factor of a spot welding machine is expected to be around 

A)  0.3 

B) Unity

C) 0.8 

D) 0.3 to 0.5 lagging 

Exp-For the active operation of B-E junctions must be forward biased. i.e base must be positive with respect to emitter i.e emitter is negative w.r.t base Also the C-B junction is made reverse biased