AC CIRCUITS - Practice Mode

1) What is the power factor in a 3 phase power measurement of two wattmeters showing equal readings?

0 1 0.5 0.8

Correct Answer: 1

2) Calculate the power factor of coil having resistance of 24 Ohm, draws the current of 5A, at 240V/ 50HZ AC supply.

0.8 0.6 0.5 0.3

Correct Answer: 0.5

3) Calculate the power factor of R.L.C circuit having resistance (R) = 15 Ohm, resultant reactance (X) = 20W connected across 240V /50Hz AC supply?

0.5 0.6 0.7 0.8

Correct Answer: 0.6

4) Calculate the value admittance (Y) of the RLC parallel circuit connected across 240volts/50Hz AC supply and 8 Amp. Current is passed through it ?

3.33 Mho 0.33 Mho 0.033 Mho 0.003 Mho

Correct Answer: 0.033 Mho

5) How the low power factor (P.F) can be improved in AC circuits?

By connecting resistors in series By connecting capacitors in series By connecting inductors in series By connecting capacitors in parallel

Correct Answer: By connecting capacitors in parallel

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