1
GATE EE 2010
+1
-0.3
The power electronic converter shown in the figure has a single-pole double-throw switch. The pole $$P$$ of the switch is connected alternately to throws $$A$$ and $$B.$$ The converter shown is a
A
step-down chopper (buck converter)
B
half-wave rectifier
C
step-up chopper (boost converter)
D
full-wave rectifier
2
GATE EE 2010
+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:

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
$$10\sin \left( {{{10}^4}t} \right)A$$
3
GATE EE 2010
+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

A
$$52\mu s$$
B
$$156\mu s$$
C
$$312\mu s$$
D
$$26\mu s$$
4
GATE EE 2010
+1
-0.3
Consider two buses connected by an impedance of $$\left( {0 + j5} \right)\Omega .$$ The bus $$1$$ voltage is $$100$$$$\angle {30^ \circ }\,\,\,V,$$ and bus $$2$$ voltage is $$100\angle {0^ \circ }\,\,\,V,$$ The real and reactive power supplied by bus $$1,$$ respectively, are
A
$$1000$$ $$W,$$ $$268$$ VAR
B
$$-1000$$ $$W,$$ $$-134$$ VAR
C
$$276.9$$ $$W,$$ $$-56.7$$ VAR
D
$$-276.9$$ $$W,$$ $$56.7$$ VAR
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