B) For the following left circuit, Assume B=200: dc 1. Determine the Q-point and draw the dc load line 2. Find the maximum peak value of base current for linear operation. Rc 500 n R 25 V 47 k Vs 10 V

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3.45 Figure 3.39 shows a oneline diagram of a system in which the three-phase generator is rated 300 MVA, 20 kV with a subtransient reactance of 0.2 per unit and with its neutral grounded through a 0.4-2 reactor. The transmis- sion line is 64 km long with a series reactance of 0.5 Q/km. The three-phase transformer T, is rated 350 MVA, 230/ 20 kV with a leakage reactance of 0.1 per unit. Transformer T, is composed of three single-phase transform- ers, each rated 100 MVA, 127/13.2 kV with a leakage reactance of 0.1 per unit. Two 13.2-kV motors M, and M, with a subtransient reactance of 0.2 per unit for each motor represent the load. M, has a rated input of 200 MVA with its neutral grounded through a 0.4-N current-limiting reac- tor. M, has a rated input of 100 MVA with its neutral not connected to ground. Neglect phase shifts associated with the transformers. Choose the generator rating as base in the generator circuit and draw the posi- tive-sequence reactance diagram showing all…

A buck-boost converter operates with an input battery. It converts +12 V to –12 V at apower level of about 75 W. the switching frequency is 120 kHz. The switches have200 ns switching time. The battery has an internal series resistance of 0.2  and seriesinductance of 200 nH. (a) What is the operating value of the duty ratio? What power is lost in the battery resistance? (b) Propose an interface structure to improve operation and decrease losses. What are the duty ratio and battery         resistance loss with your interface in place?