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1

GATE EE 2003

MCQ (Single Correct Answer)
Figure shows a thyristor with the standard terminations of anode $$(A),$$ cathode $$(K),$$ gate $$(G)$$ and the different junctions named $$J1, J2,$$ and $$J3$$. When the thyristor is turned on and conducting
A
$$J1$$ and $$J2$$ are forward biased and $$J3$$ is reverse biased
B
$$J1$$ and $$J3$$ are forward biased and $$J2$$ is reverse biased
C
$$J1$$ is forward biased and $$J2$$ and $$J3$$ are reverse biased
D
$$J1, J2,$$ and $$J3$$ are all forward biased
2

GATE EE 1998

MCQ (Single Correct Answer)
In a commutation circuit employed to turn off an $$SCR$$, Satisfactory turn-off is obtained when.
A
Circuit turn-off time
< device turn-off time
B
Circuit turn-off time
> device turn-off time
C
Circuit time constant
> device turn-off time
D
Circuit time constant
< device turn-off time
3

GATE EE 1998

MCQ (Single Correct Answer)
The uncontrolled electronic switch employed in power electronic converters is
A
thyristor
B
bipolar junction transistor
C
Diode
D
MOSFET
4

GATE EE 1998

MCQ (Single Correct Answer)
The $$MOSFET$$ switch in its on - state may be considered equivalent to
A
Resistor
B
Inductor
C
Capacitor
D
Battery

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