Basic Electrical – HI MCQ!

The rated voltage of a 3-phase power system is given as?

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For a 3-phase load balanced condition, each phase has the same value of?

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A 3-phase delta-connected symmetrical load consumes P watts of power from a balanced supply. If the same load is connected in star to the same supply, then what is the power consumption?

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Two resistors of equal values are connected series across the lines B and C of a symmetrical 3-phase, 400 V system. What is the magnitude of the voltage between the line A and the junction of resistors?

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In a series RL circuit, 9 V rms is measured across the resistor, and 15 V rms is measured across the inductor. The peak value of the source voltage is?

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If a load is purely inductive and the reactive power is 12 VAR, the apparent power is?

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For a certain load, the true power is 11 W and the reactive power is 60 VAR. The apparent power is?

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The reactance offered by a capacitor to ac of frequency 50 Hz is 102. If the frequency is increased to 100 Hz, reactance becomes?

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A square wave is fed to an R-C circuit. Then?

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A 240 V single-phase ac source is connected to a load with an impedance of 10 2. A capacitor is connected in parallel with the load. If the capacitor supplies 1,250 VAR, the real power supplied by the source is?

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