1
GATE EE 1997
MCQ (Single Correct Answer)
+1
-0.3
If a diode is connected in anti - parallel with a thyristor, then
A
Both turn off power loss and turn off time decreases
B
Turn-off power loss decreases but turn - off -time increases
C
Turn-off power loss increases, but turn off time decreases
D
None of the above
2
GATE EE 1997
MCQ (Single Correct Answer)
+1
-0.3
In a dual converter, the circulating current
A
Allows smooth reversal of load current, but increases the response time
B
Does not allow smooth reversal of load current, but reduces the response time
C
Allows smooth reversal of load current with improved speed of response
D
Flows only if there is no interconnecting inductor
3
GATE EE 1997
Subjective
+5
-0
An $$SCR$$ is connected in series with a $$300V$$ $$ac$$ supply and a $$300$$ ohms load resistor calculate

(a) The reading of a moving coil ammeter connected in series with the load and

(b) The reading of a moving iron voltmeter connected across the $$SCR$$ for firing angle of $${45^ \circ }$$

4
GATE EE 1997
Subjective
+5
-0
A single - phase bridge inverter is fed from a $$200V$$ $$d.c$$ supply and is operated at $$50$$ $$Hz.$$ It is connected to a load having a resistance of $$20$$ $$ohms$$ and an inductance of $$0.2.$$ $$H.$$ Draw the load current waveform in the the steady indicating the peak values.
EXAM MAP