 (a)Efficiency of transformer at full load and at unity power factor (in %)=   
 
    98.741052  
 
 (b)Efficiency of transformer at full load and at 0.8 power factor (in %)=   
 
    98.431252  
 
 (a)Efficiency of transformer at 75% of load and at unity power factor (in %)=   
 
    98.781692  
 
 (b)Efficiency of transformer at 75% of load and at 0.8 power factor (in %)=   
 
    98.48174  