Correct option is B
In a three-phase system, the phase displacement between the phases is 3360∘=120∘, and the instantaneous power is constant, equal to three times the power per phase.
Which of the following statements is/are true regarding symmetrical balanced three phase supply:
1 Instantaneous values of power in all of the 3 phases become zero at same instant.
A star connected resistive network with 20Ω in each phase is supplied with a three-phase ac source of 400 V. What is the total power consumed in the circuit?
What is the total number of electrons that pass through a conductor in 2 s, if the current through it is 80 mA?
An 8 kW single phase load at power factor of 0.8 leading is supplied from a single- phase ac supply. Reactive power drawn from the source is:
Power loss and voltage drop respectively, in the 2Ω resistor is

Which among the options is voltage source equivalent of the practical current source shown below?

What is the unit of magnetizing force?
A copper wire is stretched so that its length is increased by 0.2%. What is the percentage change in the resistance?
Voltage and current in a single- phase ac circuit are given by (50+j20) V and (20+j50) A respectively. What is the active power consumed in the circuit?
What is the magnetic field strength required to produce a flux density of 1mWb/m² in air?
Two inductive coils which are close to each other have a mutual inductance of 0.6 H. Current through one coil is increased from 1 A to 6 A in 0.03 s. The voltage induced in the other coil is: