AC CIRCUITS - Practice Mode

1) In which 3 phase system, the artificial neutral is required to measure the phase voltage?

3 wire star connected system 4 wire star connected system 3 wire delta connected system 4 wire delta connected system

Correct Answer: 3 wire delta connected system

2) What is the line voltage in 3 phase system if the phase voltage is 240V?

380 Volt 400 Volt 415 Volt 440 Volt

Correct Answer: 415 Volt

3) What is the power factor if one of the wattmeter gives negative reading in two wattmeter method of 3 phase power measurement?

0 0.5 Unity Less than 0.5

Correct Answer: Less than 0.5

4) What is the phase displacement between phases in a 3-phase circuit?

90 Degree 120 Degree 180 Degree 360 Degree

Correct Answer: 120 Degree

5) Which condition is called as resonance RLC circuit?

X<sub>L</sub> > X<sub>C</sub> X<sub>C</sub> > X<sub>L</sub> X<sub>L</sub> = X<sub>C</sub> R < X<sub>L</sub>

Correct Answer: X<sub>L</sub> = X<sub>C</sub>

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