1
GATE EE 2004
MCQ (Single Correct Answer)
+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 GATE EE 2004 Power Electronics - Choppers and Commutation Techniques Question 31 English
A
$$10$$ $$A$$
B
$$20$$ $$A$$
C
$$30$$ $$A$$
D
$$40$$ $$A$$
2
GATE EE 2004
MCQ (Single Correct Answer)
+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 GATE EE 2004 Power Electronics - Choppers and Commutation Techniques Question 32 English
A
$$1.6$$ $$A$$
B
$$6.4$$ $$A$$
C
$$8.0$$ $$A$$
D
$$10.0$$ A
3
GATE EE 2003
MCQ (Single Correct Answer)
+2
-0.6
A chopper is employed to charge a battery as shown in figure. The charging current is $$5A$$. The duty ratio is $$0.2.$$ The chopper output voltage is also shown in figure. The peak to peak ripple current in the charging current is GATE EE 2003 Power Electronics - Choppers and Commutation Techniques Question 33 English
A
$$0.48$$ $$A$$
B
$$1.2$$ $$A$$
C
$$2.4$$ $$A$$
D
$$1$$ $$A$$
4
GATE EE 2002
MCQ (Single Correct Answer)
+2
-0.6
In the chopper circuit shown in fig the input $$dc$$ voltage has a constant value $${{V_s}}$$. the output voltage $${{V_0}}$$ is assumed ripple free. The switch $$S$$ is operated with a switching time period $$T$$ and a duty ratio $$D.$$ What is the value of $$D$$ at the boundary of continuous and discontinuous conduction of the inductor current $${i_L}$$? GATE EE 2002 Power Electronics - Choppers and Commutation Techniques Question 34 English
A
$$D = 1 - {{{V_s}} \over {{V_0}}}$$
B
$$D = {{2L} \over {RT}}$$
C
$$D = 1 - {{2L} \over {RT}}$$
D
$$D = {{RT} \over L}$$
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