1
GATE EE 1995
Fill in the Blanks
+1
-0
Figure, show two thyristors each rated $$500A$$ (continuous) sharing a load current. Current through thyristor $$y$$ is $$120A.$$ The current through thyristor $$x$$ will be nearly __________ $$A.$$ GATE EE 1995 Power Electronics - Power Semiconductor Devices Question 33 English
2
GATE EE 1995
Numerical
+1
-0
A three phase $$ac$$-to-$$dc$$ diode bridge rectifier is supplied from a three-phase, $$440V$$ source. The rectifier supplies a purely resistive load. The average $$dc$$ voltage across the load will be ___________ $$V$$.
Your input ____
3
GATE EE 1995
MCQ (Single Correct Answer)
+1
-0.3
A single phase diode bridge rectifier supplies a highly inductive load. The load current can be assumed to be ripple free. The ac supply side current waveform will be:
A
sinusoidal
B
constant dc
C
square
D
triangular
4
GATE EE 1995
MCQ (Single Correct Answer)
+1
-0.3
A $$dc$$ to $$dc$$ transistor chopper supplied from a fixed voltage $$dc$$ source feeds a fixed resistive-inductive load and a free-wheeling diode. The chopper operates at $$1$$ $$kHz$$ and $$50$$% duty cycle. Without changing the value of the average $$dc$$ current through the load, if it is desired to reduce the ripple content of load current, the control action needed will be
A
Increase the chopper frequency keeping its duty cycle constant
B
Increase the chopper frequency and duty cycle in equal ratio
C
Decrease only the chopper frequency
D
Decrease only the duty cycle.
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