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Assume a voltage source supplies an AC voltage of amplitude V(o) between its output terminals. If the output terminals are connected to an external circuit, and an ac current of amplitude I(o) flows out of the terminals then the equivalent resistance of the external circuit is R(eq) = V(o) / I(o).
If a transformer with N(p) and N(s) turns in its primary and secondary, respectively, is placed between the source and the resistor (primary facing voltage source, secondary facing resistor), what is R(eq)?
The current flowing through a 300-mH inductance is given by 5e(-200t). Find expressions for the voltage, power, and stored energy. Sketch the waveforms to scale for 0
the Electric field intensity of a plane electromagnetic wave is given as E(z) = 8 cos (106 π t ) ix at point ( x=0 , y=0 , z=0 ) . the magnetic field intensity is the positive y direction and the wave propagates in a material with properties ε= ε0..
Show how to build each of the following single- or multiple-output logic functions using one or more 74X138 or 74X139 binary decoders and NAND gates. (hint: Each realization should be equivalent to a sum of minterms)
assume filter is connected to a pure resistive load. The cutoff frequency is not to drop below 25krad/s. What is the smallest load resistor that can be connected across the output terminals of the filter.
design op amp circuit to produce output vout which is related to inputs v1, v2 and v3 by expression vout= -(3v1+5v2+8v3). assume max permitted resistor value= 200k. use only one op amp
An iron core of cross-sectional area 200 square mm and length 320mm is evenly wound with a coil of 100 turns. When a current of 0.35A flows in the coil, a magnetic flux density of 0.12T is set up in the iron core.
Design and implement a vending machine (Moore FSM) with the following specification using VHDL. Accepts and returns only quarters Vends either Coke, or Pepsi, or a chocolate ba for a dollar Vends peanuts for 75 cents
(a) Find the slip at the maximum developed torque. (b) If we would like to get the maximum torque at starting (s=1), a method is to add more resistance to the rotor, R2,new=R2,old + Rextra, while the rotor reactance X2 stays the same.
A diode is measured to pass 0.31mA at 0.70V forward bias, and 1.12mA at 0.75 V forward bias. What are its n and Is. Assume that kT/q=0.026V. For extra credit, if the diode passes 4mA at 0.9V forward bias, what is its forward parasitic resistance
A truncated cone has a height of 50cm. The circular faces on the top and bottom have radii of 20 mm and 1mm, respectively. If the material from which the solid cone is constructed has a conductivity sigma of 2 x 10^6 S/m.
a. Neglecting resistance, determine the synchronous, transient and sub-transient reactances. b.If the machine is delivering 1.0 p.u. current at 0.8 power factor lagging at the rated terminal voltage when the short circuit is applied.
A horizontal beam of negligible weight is 38ft long andis supported by columns on each side. a verticle load of 68000lbs is applied to the beam at a distance X from the left end. find the X in ft so that raction at the left column is 47000 lbs
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