1
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
A voltage commutated chopper operating at $$1$$ $$kHz$$ is used to control the speed of $$dc$$ motor as shown in figure. The load current is assumed to be constant at $$10$$ $$A.$$

The average output voltage of the chopper will be

A
$$70$$ $$V$$
B
$$47.5$$
C
$$35$$ $$V$$
D
$$0$$
2
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
A voltage commutation circuit is shown in figure. If the turn off time of the $$SCR$$$$s$$ is $$50$$ $$\mu \sec$$ and as safety margin of $$2$$ is considered, what will be the approximate minimum value of capacitor required for proper commutation?
A
$$2.88\,\,\mu \,F\,$$
B
$$1.44\,\,\mu \,F\,$$
C
$$0.91\,\,\mu \,F\,$$
D
$$0.72\,\,\mu \,F\,$$
3
GATE EE 2005
MCQ (Single Correct Answer)
+2
-0.6
The given figure shows a step $$-$$ down chopper switched at $$1$$ $$KHz$$ with a duty ratio $$D = 0.5.$$ The peak - peak ripple in the load current is close to
A
$$10$$ $$A$$
B
$$0.5$$ $$A$$
C
$$0.125$$ $$A$$
D
$$0.25$$ $$A$$
4
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
A
$$10$$ $$A$$
B
$$20$$ $$A$$
C
$$30$$ $$A$$
D
$$40$$ $$A$$
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