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Consider the two-pole two-phase induction motor having two windings displaced 90° in space shown in Figure.The fields produced by the windings are given by Ba = Kia(t) cos(θ ) and Bb = Kib(t) cos( θ-90°). The two-phase source produces currents given by ia(t) = Im cos( t) and ib(t) = Im cos( ωt- 90° ). Show that the total field rotates. Determine the speed and direction of rotation. Also find the maximum flux density of the rotating field in terms of K and Im.
A 10-hp, 230 V, 60 Hz, three phase Y- connected, synchronous motor delivers full load at a power factor of 0.707 leading. The synchronous reactance of the motor is j5 Ω per phase. The rotationnal loss is 230W and the field winding loss is 70W.
A 74.6-kW, three phase, 440-V (line to line), four pole, 60-Hz induction motor has the following (per phase) parameters referred to the stator circuit: Rs=0.06-Ω, Rr=0.08-Ω, Xs=0.3-Ω, Xr=0.3-Ω, Xm=5-Ω The no-load power input is 3240-W at a current ..
constructed using standard value resistors a. Without making a single calculation, which resistive element will have the most voltage across it Which will have the least b. Which resistor will have the most impact on the total resistance.
To avoid reflections, an X-band waveguide section λg/4 in length is inserted between the two. Assume dominant mode propagation and that the match is at 10 GHz. a) Determine the required wave impedance of the λg/4 section
Determine the values of the lumped parasitic capacitor and inductor in a 5 ft long two-wire transmission line with air dielectric Each wire has a diameter of 1 mm and the separation between the wires is 1 inch.
A 50 cycle ac has a maximum instantaneous value of 42.42A.It crosses the zero axis in a positive direction when time is zero. Determine a)time when current first reaches a value 30a
A 6600V/230V, 50Hz single phase core type transformer has a core section 25cmX25cm. Calculate the approximate number of primary and secondary turns if the flux density in the core should not exceed 1.1Wb/m2.
The pulse generator circuit accepts a 16 Hz pulse and converts the signal to a 1 Hz pulse, that is, a clock signal once every second. This signal is then used to drive a counter that controls how the lights are illuminated.
the circuit should have a thermistorthat gives a linear out of 100-200Ω for temperature reading of 0-100 deg. let the circuit use the thermistor to control the heater so that it provide a constant temperature that can be selected between 50-80deg.
a. Let x[n] and y[n] be periodic signals with fundamental periods N1 and N2, respectively. Under what conditions is the sum x[n] + y[n] periodic If it is periodic, what is the fundamental period of this signal
Two identical CS amplifiers are connected is cascade. First stage is fed with a source Vsig having a resistance Rsig = 100k Ohm. A load resistance Rl = 10k Ohm is connected to the drain of the second stage.
Design I/O wiring to control forward and reverse 12Vdc motor using PLC OMRON CJ1M. Consider that the forward movement of the motor will be controlled by a forward button and the reverse movement of the motor will be controlled by a reverse button
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