a 440 v,60 Hz, 4Kw,delta motor draws a phase current of 3.96A at full load, 0.9 lag.Draw a fully labelled circuit diagram and calculate
A] the total power supplied.
B] efficiency.



please someone help with this....

 

The total power draw is

P=√3*V_line*I_line*pf

Where:

V_line is the line-to-line voltage
I_line is the line current - presumably this is the same as the phase current in your question. I say presumably because if the stated current is the delta winding current, then the results will be 'curious'.
pf is the power factor

As there are no losses stated then one must assume the efficiency calculation is to be based on the motor rating of 4kW.