Three-Phase Electrical Systems Quiz

Front

A balanced star-connected load has a phase voltage of 240 V. Calculate the line voltage of the system.

Back

415.7 V

Front

In a balanced delta-connected load, the phase current is measured at 15 A. What is the line current?

Back

25.98 A

Front

A three-phase star-connected alternator generates a line voltage of 440 V. What is the voltage induced in each individual phase winding?

Back

254.0 V

Front

A balanced delta-connected system is connected to a 400 V supply. If the impedance per phase is 20 Ω, what is the phase current?

Back

20 A

Front

A balanced star-connected load draws a line current of 10 A from a 415 V, three-phase supply. Calculate the total active power consumed if the power factor is 0.8.

Back

5,750 W

Front

A three-phase motor operates on a 400 V supply and consumes 10.4 kW of power with a line current of 15 A. Calculate the power factor of the motor.

Back

1.0

Front

A balanced delta load has a resistance of 30 Ω per phase. If it is connected to a 480 V three-phase supply, what is the total power dissipated? (Assume power factor is 1.0)

Back

23,040 W

Front

If a balanced star-connected load with a phase resistance of 50 Ω is connected to a 400 V supply, what is the line current?

Back

4.62 A

Front

In a balanced three-phase system, the total power is measured as 15 kW. If the line voltage is 400 V and the line current is 25 A, what is the power factor?

Back

0.866

Front

A three-phase generator produces 120 V per phase. If it is connected in Delta, what is the line-to-line voltage?

Back

120 V