1
GATE EE 1996
MCQ (Single Correct Answer)
+1
-0.3
In a thyristor $$dc$$ chopper which type of commutation results in best performance?
A
Voltage commutation
B
Current commutation
C
Load commutation
D
Supply commutation
2
GATE EE 1995
Numerical
+1
-0
Consider the chopper circuit of figure. The chopper operates at $$400$$ $$Hz$$ and $$50$$% duty cycle. The load current remains almost ripple free at $$10A.$$ Assuming the input voltage to be $$200V$$ and the devices to be ideal, the turn-off time available to the thyristor $$Th$$ $$M$$ is____________ $$\mu s$$ GATE EE 1995 Power Electronics - Choppers and Commutation Techniques Question 38 English
Your input ____
3
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.
4
GATE EE 1994
Subjective
+1
-0
Match the following

List $$-$$ $${\rm I}$$
$$A.$$ Commutation
$$B.$$ $$V$$ $$-$$ Curves
$$C.$$ Free wheeling diode
$$D.$$ Overlap

List $$-$$ $${\rm II}$$
$$P.$$ Resistive load
$$Q.$$ Inductive load
$$R.$$ Capacitive load
$$S.$$ Inter pole
$$T.$$ Source Inductance
$$U.$$ Synchronous motor

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