A class A chopper has an input voltage of 200 V. Ton = 1.5 ms and Toff = 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
Correct Answer
0.25, 50 V and 3
Power Electronics problems
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1. In a single phase full wave regulator, the rms current in each thyristors is Ir The run load current is equal to
4. A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque
Options
A. will be less than 100 N-m
B. will be more than 100 N-m
C. may be more or less than 100 N-m depending on motor parameters
9. 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
