Ac Voltage Controllers
Practice QuestionsMarks 1
1
A single-phase triac based AC voltage controller feeds a series RL load. The input AC 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
GATE EE 2024
2
In the single phase voltage controller circuit shown in the figure, for what range of triggering angle $$\left( \alpha \right)$$, the output voltage $$\left( {{V_0}} \right)$$ is not controllable?
GATE EE 2008
3
Thysistor circuits that directly convert poly phase $$ac$$ voltage from one frequency to another frequency are called _______.
GATE EE 1994
Marks 2
1
An ideal sinusoidal voltage source $v(t)=230 \sqrt{2} \sin (2 \pi \times 50 t) \vee$ feeds an ideal inductor $L$ through an ideal SCR with firing angle $\alpha=0^{\circ}$. If $L=100 \mathrm{mH}$, then the peak of the inductor current, in ampere, is closest to
GATE EE 2025
2
In the following circuit, the average voltage
$$ V_0=400\left(1+\frac{\cos \alpha}{3}\right) V $$
where $\alpha$ is the firing angle. If the power dissipated in the resistor is 64 W , then the closest value of $\alpha$ in degrees is
GATE EE 2025
3
A single-phase $$SCR$$ based $$ac$$ regulator is feeding power to a load consisting of $$5\,\,\Omega $$ resistance and $$16$$ $$mH$$ inductance. The input supply is $$230$$ $$V,$$ $$50$$ $$Hz$$ $$ac.$$ The maximum firing angle at which the voltage across the device becomes zero all throughout and the $$rms$$ value of current through $$SCR,$$ under this operating condition, are
GATE EE 2014 Set 2
4
The triac circuit shown in figure controls the $$ac$$ output power to the resistive load. The peak power dissipation in the load is
GATE EE 2004