(a)% resistance(in %)=   
 
    1.  
 
 (b)Regulation at unity power factor(in%)=   
 
    1.  
 
 Regulation at 0.8 lagging power factor(in%)=   
 
    4.4  
 
 Regulation at leading power factor(in%)=   
 
  - 2.8  
 