Power Electronics Daily Quiz #4
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Know MoreQuestion 1
Natural commutation is not possible in which of the following-
1 Rectifiers
2 AC voltage controllers
3 Step down cycloconverter
4 Step up cycloconverter
Question 2
Which of thw supply wont support natural commutation-
1 Square wave
2 Sinusoidal
3 DC
4 None
Question 3
Commutation time is the time after which commutation circuit applies reverse voltage across the device after-
1 Anode current has gone below latching current
2 Anode current has gone below holding current
3 Anode current becomes zero
4 Anode current becomes less than rms of rated current
Question 4
Total Reverse recovery time of scr is made of-
1 Delay+rise+spread time
2 Fall+tail+storage time
3 Dead+rise time
4 None
Question 5
Which of the following cant be the value of safety factor-
2
20
50
0.5
Question 6
During commutation failure the device losses control over
1 Forward blocking property
2 Forward conducting property
3 Reverse blocking property
4 Reverse conducting property
Question 7
Delay time of scr depends on-
1 Structure of scr
2 Gate current or rate of rise of gate 3 current
4 Load parameters
5 None
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