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Power Electronics
Choppers and Commutation Techniques
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1
GATE EE 2014 Set 1
MCQ (Single Correct Answer)
+1
-0.3
Figure shows four electronic switches $$(i), (ii), (iii)$$ and $$(iv).$$ Which of the switches can block voltages of either polarity (applied between terminals $$‘a’$$ and $$‘b’$$) when the active device is in the OFF state? GATE EE 2014 Set 1 Power Electronics - Power Semiconductor Devices Question 16 English
A
$$(i), (ii) $$ and $$(iii)$$
B
$$(ii), (iii) $$ and $$(iv)$$
C
$$(ii)$$ and $$(iii)$$
D
$$(i)$$ and $$(iv)$$
2
GATE EE 2012
MCQ (Single Correct Answer)
+1
-0.3
The typical ratio of latching current to holding current in a $$20$$ $$A$$ thyristor is
A
$$5.0$$
B
$$2.0$$
C
$$1.0$$
D
$$0.5$$
3
GATE EE 2011
MCQ (Single Correct Answer)
+1
-0.3
Circuit turn-off time of an $$SCR$$ is defined as the time
A
taken by the $$SCR$$ turn of
B
required for the $$SCR$$ current to become zero
C
for which the $$SCR$$ is reverse biased by the commutation circuit
D
for which the $$SCR$$ is reverse biased to reduce its current below the holding current
4
GATE EE 2010
MCQ (Single Correct Answer)
+1
-0.3
Figure shows a composite switch consisting of a power transistor $$(BJT)$$ in series with a diode. Assuming that the transistor switch and the diode are ideal, the $$I$$-$$V$$ characteristic of the composite switch is GATE EE 2010 Power Electronics - Power Semiconductor Devices Question 19 English
A
GATE EE 2010 Power Electronics - Power Semiconductor Devices Question 19 English Option 1
B
GATE EE 2010 Power Electronics - Power Semiconductor Devices Question 19 English Option 2
C
GATE EE 2010 Power Electronics - Power Semiconductor Devices Question 19 English Option 3
D
GATE EE 2010 Power Electronics - Power Semiconductor Devices Question 19 English Option 4
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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
Electrical and Electronics Measurement