1
GATE EE 2004
+1
-0.3
The circuit in figure shows a full-wave rectifier. The input voltage is $$230$$ $$V$$ $$(rms)$$ single-phase ac. The peak reverse voltage across the diodes $${D_1}$$ and $${D_2}$$ is
A
$$100\sqrt 2 \,V$$
B
$$100$$ $$V$$
C
$$50\sqrt 2 \,V$$
D
$$50$$ $$V$$
2
GATE EE 2004
+1
-0.3
The circuit in figure shows a $$3$$ $$-$$ phase half $$-$$ wave rectifier. The source is a symmetrical, $$3$$ $$-$$ phase four $$-$$ wire system. The line-to-line voltage of the source is $$100 V.$$ The supply frequency is $$400$$ $$Hz.$$ The ripple frequency at the output is
A
$$400$$ $$Hz$$
B
$$800$$ $$Hz$$
C
$$1200$$ $$Hz$$
D
$$2400$$ $$Hz$$
3
GATE EE 2004
+2
-0.6
Figure shows a chopper. The device $${S_1}$$ is the main switching device. $${S_2}$$ is the auxiliary commutation device. $${S_1}$$ is rated for $$400V, 60A.$$ $${S_2}$$ is rated for $$400V, 30 A.$$ the load current is $$20$$ $$A.$$ The main device operates with a duty ratio of $$0.5.$$ The peak current through $${S_1}$$ is
A
$$10$$ $$A$$
B
$$20$$ $$A$$
C
$$30$$ $$A$$
D
$$40$$ $$A$$
4
GATE EE 2004
+2
-0.6
Figure shows a chopper operating from a $$100$$ $$V$$ $$dc$$ input. The duty ratio of the main switch $$S$$ is $$0.8.$$ The load is sufficiently inductive so that the load current is ripple free. The average current through the diode $$D$$ under steady state is
A
$$1.6$$ $$A$$
B
$$6.4$$ $$A$$
C
$$8.0$$ $$A$$
D
$$10.0$$ A
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