AC Circuit objective questions (mcq) and answers

16.  For delta-connected circuit the correct relationship is

   A. V_L = V_ph

   B. I_ph x √ 3 = I_L

   C. V_L = I_L x √ 3

   D. Both A and B

17.  Power factor of an inductive circuit is usually improved by adding a capacitor to it in

   A. Series

   B. Parallel

   C. Either series or parallel

   D. None of the above

18.  To rated voltage of a three phase power system is given as

   A. RMS phase voltage

   B. Peak phase voltage

   C. RMS line to line voltage

   D. Peak line to line voltage

19.  To improve the power factor in three phase circuits, the capacitor bank is connected in delta to make

   A. Capacitance calculation easy

   B. Capacitance very small

   C. The connection elegant

   D. The power factor correction is more effective

20.  Three unequal impedences are connected in delta to a three phase, three wire system

   A. The voltage across the three phases will be different

   B. Both of the phase current and line currents will be unbalanced

   C. Phase current will be unbalanced but line currents will be balanced

   D. None of the above

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