1
GATE EE 2010
MCQ (Single Correct Answer)
+2
-0.6
The L-C circuit shown in the figure has an inductance $$L=1mH$$ and a capacitance $$C = 10\mu F.$$
The initial current through the inductor is zero, while the initial capacitor voltage is $$100$$ $$V.$$ The switch is closed at $$t = 0.$$ The current $$i$$ through the circuit is:
![GATE EE 2010 Power Electronics - Choppers and Commutation Techniques Question 29 English](https://gateclass.static.cdn.examgoal.net/0sRN3VTS4FEp7PK6V/BVLm7PELceE5dONkWAeZQH1kanNq8/6WEvwgU6J0VjgjlsVNy04m/uploadfile.jpg)
2
GATE EE 2010
MCQ (Single Correct Answer)
+2
-0.6
The L-C circuit shown in the figure has an inductance $$L=1mH$$ and a capacitance $$C = 10\mu F.$$
The $$L$$-$$C$$ circuit $$Q.13$$ is used to commutate a thyristor, which is initially carrying a current of $$5A$$ as shown in the figure below. The values and initial conditions of $$L$$ and $$C$$ are the same as in $$Q.13.$$ The switch is closed at $$t = 0.$$ If the forward drop is negligible, the time taken for the device to turn off is
![GATE EE 2010 Power Electronics - Choppers and Commutation Techniques Question 28 English](https://gateclass.cdn.examgoal.net/HJRIkjQUQHazsbFnb/yiXwHMMirKt6NpqdbUTGnYxS8wuxj/k7BHcFpS7z8nosObePWs95/uploadfile.jpg)
3
GATE EE 2009
MCQ (Single Correct Answer)
+2
-0.6
In the chopper circuit shown, the main thyristor $$\left( {{T_M}} \right)$$ is operated at a duty ratio of $$0.8$$ which is much larger than the commutation interval. If the maximum allowable reapplied $${{dV} \over {dt}}$$ on $${T_M}$$ is $$50$$ $$V/\mu s,$$
what should be the theoretical minimum value of $${C_1}?$$. Assume current ripple through $${L_0}$$ to be negligible.
what should be the theoretical minimum value of $${C_1}?$$. Assume current ripple through $${L_0}$$ to be negligible.
![GATE EE 2009 Power Electronics - Choppers and Commutation Techniques Question 9 English](https://gateclass.static.cdn.examgoal.net/JkdOn3sRdrzE4yV2s/9lzKjuupl48t5zGHu4TLZTfhvMtbh/dw8f5EpJqKcLnoITDWtqqR/uploadfile.jpg)
4
GATE EE 2008
MCQ (Single Correct Answer)
+2
-0.6
In the circuit shown in the figure, the switch is operated at a duty cycle of $$0.5.$$ A large capacitor current is connected across the load. The inductor current is assumed to be continuous.
![GATE EE 2008 Power Electronics - Choppers and Commutation Techniques Question 10 English](https://gateclass.static.cdn.examgoal.net/3o9OQgup5iT1v1AcI/9a6FXSIxl6Nbvn0Wa5hSsznTXC2NH/zJCr09eNueBEjClPcf1Wap/uploadfile.jpg)
The average voltage across the load and the average current through the diode will respectively be
Questions Asked from Choppers and Commutation Techniques (Marks 2)
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GATE EE Subjects
Electromagnetic Fields
Signals and Systems
Engineering Mathematics
General Aptitude
Power Electronics
Power System Analysis
Analog Electronics
Control Systems
Digital Electronics
Electrical Machines
Electric Circuits