Class 4 (4th Engineer) MET 📅 Feb 2023

Exam Question

(a) Show graphically the effect of a.c. Current due to pure inductive load. (6)

(b) A 220V, 50Hz supply is applied to a choke-coil of negligible resistance and the circuit current is measured to be 2.5A. Find the inductance of the coil and the power dissipated. (10)

Reference Answer

### (a) Graphical Effect of A.C. Current in a Pure Inductive Load
In a purely inductive AC circuit, the inductor opposes the change in current flow. This opposition results in the current (`I`) lagging the applied voltage (`V`) by a phase angle of 90 degrees (or π/2 radians).
This relationship can be represented graphically in two ways:
1. **Waveform Diagram**: This diagram plots the instantaneous voltage and current as sine waves against time or angle.

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