AC CIRCUITS - Practice Mode

1) What is effect of current in a RC parallel circuit?

IC Leads IR by 90 Degree IC Lags IR by 90 Degree IR Leads IC 90 Degree IR & IC are in phase

Correct Answer: IC Leads IR by 90 Degree

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

3 ohm 5 ohm 7 ohm 12 ohm

Correct Answer: 5 ohm

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

1 Kw 2 Kw 3 Kw 4 Kw

Correct Answer: 3 Kw

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

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

5) 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?

Unity Above 0.5 0.5 Below 0.5

Correct Answer: 0.5

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