12) What is impedance in AC, RL series circuit if resistance is 3 ohm and inductive reactance 4 ohm?

13) What is the reactive power, if the active power is 4 Kw, and the apparent power is 5 Kw in a 3 phase circuit?

14) Where the artificial neutral is required for measuring phase voltage in 3 phase circuit?

15) What is the power factor, if one wattmeter reads zero and other reads some positive reading in two wattmeter method of 3 phase power measurement?

16) What is the name of star point in star connection system?