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 17 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 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 20 English
Your input ____
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 19 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
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 21 English
Your input ____
GATE EE Subjects
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12