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Q4. a) Explain the significance of the root mean square value of an alternating current or

voltage wave form; Define the form factor of such a wave form. (6)
b) A 72 KVA transformer supplies a heating and lighting load of 12 kW at unity power factor and a motor load of 70 KVA at 0.766 (lagging) power factor. Calculate the

minimum rating of the power-factor improvement capacitors which must be connected

in the circuit to ensure that the transformer does not become overloaded (10)