In figure, thyristor Th is in off state. When thyristor is turned on, the peak t

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Question
In figure, thyristor Th is in off state. When thyristor is turned on, the peak thyristor current can be
Options
A. 5 A
B. 10 A
C. 15 A
D. 20 A

Correct Answer

15 A

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1. When an SCR is in forward blocking mode, the applied voltage
Options
A. appears across only one junction
B. is equally shared by two junctions
C. is equally shared by three junctions
D. may appear across one or more junctions

3. A class D chopper
Options
A. can operate in first quadrant only
B. can operate in second quadrant only
C. can operate in either first or fourth quadrant
D. can operate in all the quadrants

4. All other parameters remaining the same, a 3 phase bridge inverter with 180� mode of operation
Options
A. has the same peak thyristor current as in 120� mode of operation
B. has higher peak thyristor current than in 120� mode of operation
C. has lower peak thyristor current than in 120� mode of operation
D. any of the above

5. In pulse width modulation of chopper
Options
A. T is kept constant and T_on is varied
B. T_on is kept constant T is varied
C. both T and T_on are varied
D. either T or T_on is varied

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