Recent content by cnh1995

Thanks for the response! Suppose C(s) is a voltage signal. In the diagram below, the blue feedback path directly goes to the summing block, indicating a voltage signal subtraction. But the red feedback path also goes to the summing block and it is not a voltage signal (it is voltage* 1/s, or...

I got the answer by simplifying the block diagram using standard block diagram reduction techniques and a bit of algebraic manipulation. However, in the summing block between 1/s and G(s), they are subtracting both C(s) and C(s)/s at the same time (despite having different units)! As per my...

What is the correct answer that you are getting? Is it for the voltage across the inductor or for the current through the inductor? As this problem is about the instant immediately after closing the switch, you really don't need the full time-dependent solution for the current or the voltage...

This looks correct.

That resistance will matter only if there is current through it. Is that the case at the null deflection point?

Are you sure the question mentions the internal resistance of the dc source and not of the secondary cell? They both are dc sources after all.

I think the diagram is provided along with the problem statement and the OP is asked to develop its control-system block diagram from this.

Can you upload your attempt at a solution?

R1 is not considered and R1 is 1kohm?

Yes, for someone with no/little scientific background, his choice of words and expressions would most likely imply energy is transported through wires, which is misleading.

Yes that is what I thought. Also when he freaked out about "standing in the way of energy flowing through air to power a lightbulb" , I thought of birds chilling on a high voltage transmission line conductor. When birds stand on a high power conductor, some energy must be flowing through their...

I came across this video where Dr. Tyson talks about Nikola Tesla. Neil Tyson on Tesla. From 4:47 onwards, he says "We now send energy through wires", and talks about how bizarre it would be to walk around/stand in the way of such energy flow. Further he says the power transmission lines are...

Yes. Both T1 and the generator have the same voltage rating(and are at the same voltage level in the line diagram). This is why only the ratio of MVA ratings is used to find the new pu reactance. The MVA rating of T2 is same as the base MVA (300MVA). The 0.1 pu reactance of T2 is w.r.t its own...

In a stand alone generator, increasing field current or generator torque will change the terminal voltage and speed. Any changes in load impedance and load power factor will also affect terminal voltage and frequency. But I do not have much information on how the terminal voltage and frequency...

Not necessarily. Torque in a rotating machine is produced by the interaction of the stator and rotor magnetic fields. If you look up the torque equation in terms of the fields, the electromagnetic torque produced is proportional to the product of field strengths but more importantly, it is also...