1
GATE EE 2017 Set 1
MCQ (Single Correct Answer)
+2
-0.6
The input voltage $${V_{DC}}$$ of the buck-boost converter shown below varies from $$32$$ $$V$$ to $$72$$ $$V.$$ Assume that all components are ideal, inductor current is continuous, and output voltage is ripple free. The range of duty ratio $$D$$ of the converter for which the magnitude of the steady state output voltage remains constant at $$48$$ $$V$$ is GATE EE 2017 Set 1 Power Electronics - Choppers and Commutation Techniques Question 19 English
A
$${2 \over 5} \le D \le {3 \over 5}$$
B
$${2 \over 5} \le D \le {3 \over 4}$$
C
$$0 \le D \le 1$$
D
$${1 \over 3} \le D \le {2 \over 3}$$
2
GATE EE 2017 Set 2
Numerical
+2
-0
In the circuit shown all elements are ideal and the switch $$S$$ is operated at $$10$$ $$kHz$$ and $$60$$% duty ratio. The capacitor is large enough so that the ripple across it is negligible and at steady state acquires a voltage as shown. The peak current in amperes drawn from the $$50$$ $$V$$ $$DC$$ source is ________. (Give the answer up to one decimal place.) GATE EE 2017 Set 2 Power Electronics - Choppers and Commutation Techniques Question 20 English
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3
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 21 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 $${V_C} = {\delta \over {1 - \delta }}{V_{dc}}$$
4
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 22 English
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