AC CIRCUITS - Practice Mode

1) Calculate the apparent power in KVA of 3 phase 415V, 50 Hz, star system, if the line current (IL) is 16A at 0.8 power factor.

15.2 KVA 11.5 KVA 9.2 KVA 5.3 KVA

Correct Answer: 11.5 KVA

2) What will be the readings of two watt meters (W1& W2) in 3 phase power measurement, if the power factor is zero?

W1 & W2 both are positive reading W1 is Positive and W2 is negative reading W1 is equal to W2 but with opposite signs Zero W1 is Positive reading, and W2 is negative reading

Correct Answer: W1 is equal to W2 but with opposite signs

3) What is the maximum value of voltage for 240 volt RMS?

240V 415V 339.5V 376.8V

Correct Answer: 339.5V

4) What is the phase displacement in a single phase AC circuit?

90 Degree 120 Degree 180 Degree 270 Degree

Correct Answer: 90 Degree

5) Calculate the line current of the 3 phase 415V 50 HZ supply for the balanced load of 3000 watt at 0.8 power factor is connected in star.

8.5 A 5.2 A 4.5 A 3.4 A

Correct Answer: 5.2 A

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