1
GATE EE 2013
MCQ (Single Correct Answer)
+2
-0.6
Thyristor $$T$$ in the figure below is initially off and is triggered with a single pulse of width $$10\mu s.$$ It is given that $$L = \left( {{{100} \over \pi }} \right)\mu H$$ and $$C = \left( {{{100} \over \pi }} \right)\mu F.$$ Assuming latching and holding currents of the thyristor are both zero and the initial charge on $$C$$ is zero, $$T$$ conducts for
![GATE EE 2013 Power Electronics - Power Semiconductor Devices Question 10 English](https://gateclass.static.cdn.examgoal.net/pJbEY9g6kswE5kHGg/vzq4NmCBeuj3LQBRwgoXWTvh5vuya/P4ezTBsELIMEoLrKCLMdha/uploadfile.jpg)
2
GATE EE 2009
MCQ (Single Correct Answer)
+2
-0.6
Match the switch arrangements on the top row to be steady $$-$$ state $$V$$ - $$I$$ characteristics on the lower row. The steady state operating points are shown by large black dots.
![GATE EE 2009 Power Electronics - Power Semiconductor Devices Question 8 English 1](https://gateclass.cdn.examgoal.net/sl3ttr3Y6lCpBpTKb/dCsqrt48rsTBMrXHpU3VcdHU3aWVG/uUuDyv09lWof0rUnc1s5UP/uploadfile.jpg)
![GATE EE 2009 Power Electronics - Power Semiconductor Devices Question 8 English 2](https://imagex.cdn.examgoal.net/kjKA4jqx6YrxEGgyc/mwsG30Bjr9fvVpCeJBs4EhwgKyWLK/FDcgcVdwJE4UbYgz9Aoyn1/uploadfile.jpg)
3
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
A $$1:1$$ pulse transformer $$(PT)$$ is used to trigger the $$SCR$$ in the adjacent figure. The $$SCR$$ is rated at $$1.5$$ $$kV$$, $$250$$ $$A$$ with $${{\rm I}_L} = 250\,mA,\,\,{{\rm I}_H} = 150\,mA,$$ and $${{\rm I}_{G\max }} = 150mA$$ with $${{\rm I}_L} = 250\,mA,$$ $${{\rm I}_{G\min }} = 100mA.$$ The $$SCR$$ is connected to an inductive load, where $$L$$ $$=150$$ $$mH$$ in series with a small resistance and the supply voltage is $$200$$ $$V$$ $$dc.$$ The forward drops of all transistors/diodes and gate $$-$$ cathode junction during $$ON$$ state are $$1.0V$$
The resistance $$R$$ should be
![GATE EE 2007 Power Electronics - Power Semiconductor Devices Question 7 English](https://imagex.cdn.examgoal.net/FLvAtMHDSaQAF7Ksp/w58QHX4WgO41Bs9KYfS8H8fTjKx1U/jDp56TnXr7E9jnbg15l3ht/uploadfile.jpg)
4
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
A $$1:1$$ pulse transformer $$(PT)$$ is used to trigger the $$SCR$$ in the adjacent figure. The $$SCR$$ is rated at $$1.5$$ $$kV$$, $$250$$ $$A$$ with $${{\rm I}_L} = 250\,mA,\,\,{{\rm I}_H} = 150\,mA,$$ and $${{\rm I}_{G\max }} = 150mA$$ with $${{\rm I}_L} = 250\,mA,$$ $${{\rm I}_{G\min }} = 100mA.$$ The $$SCR$$ is connected to an inductive load, where $$L$$ $$=150$$ $$mH$$ in series with a small resistance and the supply voltage is $$200$$ $$V$$ $$dc.$$ The forward drops of all transistors/diodes and gate $$-$$ cathode junction during $$ON$$ state are $$1.0V$$
The minimum approximate volt $$-$$second rating of the pulse transformer suitable for triggering the $$SCR$$ should be: (Volt - second rating is the maximum of product of the voltage and the width of the pulse that may be applied)
Questions Asked from Power Semiconductor Devices (Marks 2)
Number in Brackets after Paper Indicates No. of Questions
GATE EE Subjects
Electromagnetic Fields
Signals and Systems
Engineering Mathematics
General Aptitude
Power Electronics
Power System Analysis
Analog Electronics
Control Systems
Digital Electronics
Electrical Machines
Electric Circuits