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
A
$$5cos\left( {5 \times {{10}^3}t} \right)A$$
B
$$5\sin \left( {{{10}^4}t} \right)A$$
C
$$10cos\left( {5 \times {{10}^3}t} \right)A$$
D
$$10\sin \left( {{{10}^4}t} \right)A$$
2
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. GATE EE 2009 Power Electronics - Choppers and Commutation Techniques Question 9 English
A
$$0.2\,\,\mu \,F$$
B
$$0.02\,\,\mu \,F$$
C
$$2\,\,\mu \,F$$
D
$$20\,\,\mu \,F$$
3
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

The average voltage across the load and the average current through the diode will respectively be

A
$$10$$ $$V,$$ $$2A$$
B
$$10$$ $$V,$$ $$8A$$
C
$$40$$ $$V,$$ $$2A$$
D
$$40$$ $$V,$$ $$8A$$
4
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
The circuit in the figure is current commutated $$dc$$ $$-$$ $$dc$$ chopper where, $$T{h_M}$$ is the main $$SCR$$ and $$T{h_AUX}$$ is the auxiliary $$SCR$$. The load current is constant at $$10$$ $$A.$$
$$T{h_M}$$ is $$ON$$
$$T{h_AUX}$$ is trigged at $$t=0.$$ $$T{h_M}$$ is turned $$OFF$$ between. GATE EE 2007 Power Electronics - Choppers and Commutation Techniques Question 11 English
A
$$0{\mkern 1mu} {\mkern 1mu} \mu s < t \le 25{\mkern 1mu} {\mkern 1mu} \mu s$$
B
$$25{\mkern 1mu} {\mkern 1mu} \mu s < t \le 50{\mkern 1mu} {\mkern 1mu} \mu s$$
C
$$50{\mkern 1mu} {\mkern 1mu} \mu s < t \le 75{\mkern 1mu} {\mkern 1mu} \mu s$$
D
$$75{\mkern 1mu} {\mkern 1mu} \mu s < t \le 100{\mkern 1mu} {\mkern 1mu} \mu s$$
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