Q.7) The circuit shown in figure 4 is connected to a 240 v, 50HZ supply. Determine the current waveform, the mean load voltage and the mean load current for a load of. a) a pure resistive load of 102 b) an inductance of 0,1H in series with a 10 2 resistance.

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Q7
A thyristor circuit with 25Q resistive loads withstands a (dv/dt)x rating of
40V/us. The surge voltages that are expected to arise are steep transients of 650V. What
size of snubber circuit capacitance is needed to prevent dv/dt triggering?
[0.65 µFI
Q.7) The circuit shown in figure 4 is connected to
a 240 v, 50HZ supply. Determine the current
waveform, the mean load voltage and the mean
load current for a load of
a) a pure resistive load of 10Q.
b) an inductance of 0,1H in series with a 10 2
resistance.
Load
Figure 4
(a)108 V, 10:8 A, b) 86 V, 8.6 A]
Q 8) If the diode in the above question is replaced by a thyristor, determine the mean load
voltage and current if the load is 10Q in series with an inductance of 0,1H and the firing
of the thyristor is delayed by 90". The ac. supply is 240V, 50HZ and the thyristor
voltage drop is to be ignored.
(31.8V, 3.18A]
Transcribed Image Text:A thyristor circuit with 25Q resistive loads withstands a (dv/dt)x rating of 40V/us. The surge voltages that are expected to arise are steep transients of 650V. What size of snubber circuit capacitance is needed to prevent dv/dt triggering? [0.65 µFI Q.7) The circuit shown in figure 4 is connected to a 240 v, 50HZ supply. Determine the current waveform, the mean load voltage and the mean load current for a load of a) a pure resistive load of 10Q. b) an inductance of 0,1H in series with a 10 2 resistance. Load Figure 4 (a)108 V, 10:8 A, b) 86 V, 8.6 A] Q 8) If the diode in the above question is replaced by a thyristor, determine the mean load voltage and current if the load is 10Q in series with an inductance of 0,1H and the firing of the thyristor is delayed by 90". The ac. supply is 240V, 50HZ and the thyristor voltage drop is to be ignored. (31.8V, 3.18A]
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