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A three phase, 690V, star connected, 50Hz, four-pole wound-rotor induction generator is used for a new model wind turbine. It operates at a nominal speed of 1570 rpm when the rotor windings are short-circuited whilst generating rated power. It has the following parameters per phase (all quantities referred to the stator):
Rs = 0.2 Ω ,Rr = 0.13 Ω ,Xs = Xr = 0.45 Ω ,Xm = 36 Ω
(a) Derive the Thevenin equivalent circuit parameters (Vth, Rth & Xth) for this machine. (b) Find the value of slip at which maximum torque is developed. (c) Find the maximum torque developed when motoring and generating. (d) How much stator referred „external? resistance per phase should be connected in the rotor circuit such that maximum torque in generation mode occurs at a speed of 2,000 rpm
Using 4-bit numbers to save space, multiply 3ten x 4ten in binary.
Determine the energy uses on farms in middle east and determine whether or not it is better to use a stand alone system or a grid connected system for the application on farms.
Capacity, Data and Transfer Rates, Access Time of Disk Drive, A hard disk drive has 10 disks and 18 surfaces available for recording. Each surface is composed of 200 concentric tracks and the disks rotate at 7200 r.p.m.
Calculate the de Broglie wavelength, for: (a) An electron with kinetic energy of (a) 1.0 eV, and (ii) 100 eV. (b) A proton with kinetic energy of 1.0 eV. (c) A singly ionized tungsten atom with k in.
Draw the per-phase impedance diagram of the power system and Draw the impedance diagram in per-unit system
Using this method, create and test a minority vote circuit, a circuit designed to indicate when one or no inputs are HIGH. Determine the appropriate SOP equations, enter, compile, simulate, download, and test your solution.
A 3.5inch floppy disc has a nominal capacity of 2 MB. Note that there are eight bits to a byte. Estimate the area of magnetic material allocated to each bit of information. Clearly state any assumption made and carefully note any measured quantiti..
Determine the value of the output voltage due to the voltage source only (Vol), and due to the current source only (V02).
A network router connects multiple computers together and allows them to send messages to each other. If two or more computers send messages simultaniously, they collide and the messages must be resent. Design a collision free circuit for a router..
algorithms to show the differences in the intra prediction in the h.264 and hevc coding standards. it should indicate how the intraprediction in the two coding standards makes a difference in their efficiency.
If we have a 600ohm transmission line terminated with a 1200ohm resistor, how long must the transmission line be if the input impedance is purely real?
A ripple carry adder is made of full adder cells each having 1 unit of combinational delay. To convert a four-bit ripple carry adder into a four stage pipeline adder proceed as following.
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