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A single-phase triac based A C voltage controller feeds a series R L load. The input A C supply is 230 V, 50 Hz. The values of R and L are 10 Ω and 18.37 mH, respectively. The minimum triggering angle of the triac to obtain controllable output voltage is

1. 15°
2. 30°
3. 45°
4. 60°

Correct answer: 30°

Solution

The minimum triggering angle of 30° is required to ensure that the triac can effectively control the output voltage across the RL load, allowing for sufficient time for the inductor to build up its magnetic field and avoid excessive current spikes.

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