1
GATE EE 2015 Set 2
Numerical
+2
-0
For the switching converter shown in the following figure, assume steady-state operation. Also assume that the components are ideal, the inductor current is always positive and continuous and switching period is $${T_s}.$$ If the voltage $${V_L}$$ is as shown, the duty cycle of the switch $$S$$ is __________. GATE EE 2015 Set 2 Power Electronics - Choppers and Commutation Techniques Question 18 English 1 GATE EE 2015 Set 2 Power Electronics - Choppers and Commutation Techniques Question 18 English 2
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2
GATE EE 2015 Set 1
Numerical
+2
-0
A buck converter feeding a variable resistive load is shown in the figure. The switching frequency of the switch $$S$$ is $$100$$ $$kHz$$ and the duty ratio is $$0.6.$$ The output voltage $${V_0}$$ is $$36$$ $$V.$$ Assume that all the components are ideal, and that the output voltage is ripple-free. The value of $$R$$ (in $$Ohm$$) that will make the inductor current ($${{\rm I}_L}$$) just continuous is _______. GATE EE 2015 Set 1 Power Electronics - Choppers and Commutation Techniques Question 17 English
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3
GATE EE 2015 Set 1
Numerical
+2
-0
The circuit shown is meant to supply a resistive load $${R_L}$$ from two separate $$DC$$ voltage sources. The switches $$S1$$ and $$S2$$ are controlled so that only one of them is ON at any instant. $$S1$$ is turned on for $$0.2$$ $$ms$$ and $$S2$$ is turned on for $$0.3$$ $$ms$$ in a $$0.5$$ $$ms$$ switching cycle time period. Assuming continuous conduction of the inductor current and negligible ripple on the capacitor voltage, the output voltage $${V_0}$$ (in Volt) across $${R_L}$$ is __________. GATE EE 2015 Set 1 Power Electronics - Choppers and Commutation Techniques Question 16 English
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4
GATE EE 2015 Set 1
MCQ (Single Correct Answer)
+2
-0.6
A self commutating switch $$SW,$$ operated at duty cycle $$\delta $$ is used to control the load voltage as shown in the figure GATE EE 2015 Set 1 Power Electronics - Choppers and Commutation Techniques Question 15 English

Under steady state operating conditions, the average voltage across the indicator and the capacitor respectively, are

A
$${V_L} = 0$$ and $${V_C} = {1 \over {1 - \delta }}{V_{dc}}$$
B
$${V_L} = {\delta \over 2}{V_{dc}}$$ and $${V_C} = {1 \over {1 - \delta }}{V_{dc}}$$
C
$${V_L} = 0$$ and $${V_C} = {\delta \over {1 - \delta }}{V_{dc}}$$
D
$${V_L} = {\delta \over 2}{V_{dc}}$$ and $${V_C} = {\delta \over {1 - \delta }}{V_{dc}}$$
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