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The name plate details at the rated conditions corresponding to a 2 pole, three phase induction motor are as follows: 60 Hz, 400 VL-L (RMS) , rated torque of 40 Nm at the rated speed of 3492 rpm. The stator resistance Rs is 0.25 Ω, and the stator as well as rotor leakage inductances are negligible. All losses except in the stator and rotor resistances can also be neglected. The reflected rotor resistance, Rr' is 0.3 Ω. The magnetizing current in each phase is 10 A (RMS). The motor is connected to a load with a torque TL = 5 + 0.08ω Nm , ω is the speed in rad/sec.
(a) Can this load be run by the above motor (and a PPU) at 1500 rpm? If no, give reasons. If yes, calculate the frequency and magnitude of the voltages to be applied to the stator and draw the corresponding per phase equivalent circuit.(b) Can this load be run by the above motor (and a PPU) at 4100 rpm? If no, give reasons. If yes, calculate the frequency and magnitude of the stator voltages.
In a RLC circuit, the generator voltage varies in time, where the amplitude of e max= 1.2 volt and emf freq.= 0.5 Hz , which the max current is equal to the max current when the freq. of emf = 3.0 Hz, which is .00033 A.
During an AP, the membrane potential typically moves from -70mV to +20mV and back again. In a cell with 10um radius and 1uF/cm^2, how many charges need to move across the membrane (and back again) to get this 90 mV voltage fluctuation?
The memory unit, 2M x 32, is specified by the number of words times the number of bits per word. How many address lines and input-output data lines are needed And give the number of bytes stored in the memory.
A single phase 220V system draws a current of 15A at a lagging power factor of 0.8. Calculate the value of a capacitor that can be used to improve the power factor of this system to 0.95 lagging.
A 230V shunt motor having an armature resistance of 0.05 and a field resistance of 75 draws a line current of 7 A while running light at 1120 rev/min. The line current at a given load is 46 A.
Describe the characteristics of the series RC filter circuit with the output across the resistive component. Distinguish the pass and stop bands with reference to the cutoff frequency. Also, state what happens to the circuit complex impedance at t..
A three-phase, 60Hz, wye-connected synchronous generator has balanced line-to-line voltages of 480V at its terminals. The generator is supplying power to two balanced and delta connected, three-phase loads. the first load is made up
One day, John and Amparo, a senior EE student, were trying to fix Jasmine's old-fashioned (projection) TV, which contained the circuit shown below, apparently with a bad connection. John said that the RLC series branch had an impedance of 1ohm
Determine the value of the constant c such that the following functions are valid probability functions: A. p(x) = cx/20, x = 1,2,3,4,5,6 and zero elswhere. B. p(x) = c(X^2 + 1), x = 1,2,3,4,5, and zero elsewhere.
given the electron and hole concentrations for a 2 micro meter region of Silicon. At x=0 the concentration of electrons is 10^16 and the concentration of holes is 1.01x10^18. At x=2 micro meters the concentration of electrons is 10^4
Find the electron and hole concentrations, mobilities, and resistivities of silicon samples at 300K with an impurity concentration of (a) 5X10^15 boron atoms and (b) 2X10^16 boron atoms and a.5X10^16 arsenic atoms.
Calculate the count that should appear in the timer capture register TC0 if a 125 kHz rectangular wave is inputted on timer pin PT0 while TCTL4 is preset for falling edge detection. Assume a 24 MHz e-clock, TMSK2 was programmed
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