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A 5-MVA, 66:13.2kV, three-phase transformer supplies a three-phase resistive load of 4,500kW at 13.2kV. What is the load resistance in ohms as measured from the line-to-neutral on the high-voltage side of the transformer, if it is connected in Y-Y.
A 230kVA, 2300/230V, 60 Hz, step-down transformer has the following parameters. RH =1.2-ohm, XH =3-ohm, RL =12m-ohm, XL =30m-ohm, Rh+c=2k-ohm, , Xm =1.8k-ohm. If the transformer operates at half load with unity power factor
Discuss why phasor analysis can only be performed on single-frequency circuits. For multiple frequencies what type of analysis must be performed Discuss the advantages of transforming time-domain circuits into the corresponding frequency domain.
What resistance must be connected in series with a heater rated at 150mA with hot resistance of 320 ohm in order to operate it safely from a 117-V source. What power rating must this resistor have
A process has the dynamics G(s)=5/s^2. Design a unity negative feedback controller of the form G.c(s)=Ks+1 for a step response exhibiting approximately 15% overshoot.
The voltage across the load must remain between 4.7 and 5.0 V for all values of load current. Come up with (draw) a voltage-divider network to supply the load. You may assume that resistors of any value desired are available.
Consider a continuos time LTI system with step response given by ys(t) = tu(t) - (t - 2)u(t-2). Determine the output y(t) if the input to the system is given by x(t) = u(t) - u(t - 2) using complex domain (not time domain) analysis techniques.
Determine the position x and the tension in the cord that is required for equilibrium. The cord passes through the smooth ring at B and has an unstretched length of 6ft and stiffness of k = 50lb/ft.
Three of the above single phase transformers are connected as a 3-phase transformer bank. The high voltage side of the transformer bank is connected in Y and the power is supplied to the transformer bank through a transmission line
design a multirange ammeter with ranges of 1-10mA,0-100mA, and 0-1500mA, using a 5mA movement whose internal resistance is 3.8ohms. draw a circuit diagram of the meter.
In a processing plant, jars on a conveyer belt are cleaned out with a high-pressure air jet just prior to being filled (Figure Below). When a jar approaches the cleaning station, it activates a switch (with both NO and NC contacts).
In animation programs, special effects are achieved by changing the properties of objects. What instruction is used to change the opacity and color properties of objects in the Zeus example world?
A tractor-trailer truck driver friend often delivers to companies that do not have a fork truck or loading dock. She wants to install a lift-gate on her trailer so she can load and unload her truck without a fork truck.
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