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Academics – Electro-Technology : 2012/DEC/04

Question

Q9. A single-phase circuit comprises a coil having resistance and inductance, 45Ω resistor and a capacitor in series across a 40 V variable frequency supply. When the frequency is 400 Hz, the current reaches its maximum value of 0.8 A and the voltage across the capacitor is 170 V.

(a) Calculate EACH of the following:

(i) The value of the capacitor;

(ii) The resistance and inductance of the coil;

(iii) The p.d. across the coil;

(iv) The supply kVAR.

(b) Sketch a phasor diagram showing ALL the volt drops in relation to the circuit current.

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