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Power Electronics problems

2. A class A chopper has an input voltage of 200 V. T_on = 1.5 ms and T_off = 4.5 ms. The duty cycle, average output voltage and ripple factor respectively are
Options
A. 0.5, 100 V and 1
B. 0.25, 50 V and 3
C. 0.25, 50 V and 1
D. 0.5, 100 V and 3

6. An SCR is triggered at 80� in the positive half cycle, only. The rms anode current is 25 A. If the firing angle is changed to 160�, the rms current is likely to be
Options
A. 25 A
B. 12.5 A
C. less than 25 A
D. less than 12.5 A

8. Assertion (A): A fully controlled bridge converter can operate in first and fourth quadrant.
Reason (R): A semi converter is cheaper than a full converter.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

9. In auxiliary commutated chopper, the peak value of thyristor current is
Options
A. equal to peak value of load current
B. equal to peak value of capacitor current
C. sum of peak value of load current and capacitor current
D. none of the above

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