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A four-pole induction motor drives a load at 2500 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-phase ac voltages. Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2 hp. If the dc-to-ac converter has a power efficiency of 88 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source.
(a) If E=Exax andH=Hyay, begin with Maxwell's equations and determine the second order partial differential equation thatEx must satisfy. (b) Show that Ex=E0 cos (ωt-βz) is a solution of that equation for a particular value of β.
A core with three legs is shown in Figure. Its depth is 8 cm, and there are 400 turns on the center leg. The remaining dimensions are shown in the figure. The core is composed of a steel having the magnetization curve shown in Figure. Answer the ..
Consider a discrete-time linear time-invariant system with impulse response h[n]. If the input x[n] is a periodic sequence with period N (i.e., if x[n]=x[n+N]), show that the output y[n] is also periodic sequence with period N.
begin to figure out how to determine which BJT is off or why. I tried modeling the BJT's as two diodes: NPN BJTshares anodes and PNP shares cathodes. Doing it this way doesnot provide the correct answers though. How to determine which one is off o..
Properties of Electricity Discuss a practical application of a decade resistance box. Explore alternative variable resistors available to the engineers and discuss their accuracy and resolution? (Initial post for this question must be at least 75 wor..
A 6 pole, 60 hz induction motor is wye connected and has a rated slip of .03 with the follwoing parameters: Rs=0.5 ohms, Rr'=0.3ohms, Xs=J1 ohms, Xr'=J0.35 ohms, Xm=j20 ohmsand the total rotational losses=7300 watts.
One of the firm's suppliers discounts prices for larger quantities. The first 1000 parts are $13 each. The next 2000 are $12 each. All parts in excess of 3000 cost $11 each. What are the average cost and marginal cost per part
Two balanced three phase loads that are connected in parallel arefed by a three pahse line having a series impedence of 0.4+j2.7ohms per phase.one of the loads absorbs 560kva at 0.707 pf laggingand th eother 132kWat unity pf.
If an electromagnetic wave described by the TE20 mode is excited and is propagating down the waveguide, what happens to the electromagnetic wave described by the TE10 mode?
determine the capacitance of a parallel-plate capacitor having plates 14cm by 30cm separated by 0.01mm. The dielectric has (epsilon)(r)=15
The transmission line has an impedance of 600 ohms and is terminated in a load of 600 ohms. The transmitter delivers an average power of 0.1 W to the input of the line.
given a "black box" with two terminals. You play around with the box for awhileand make the following observations: (i) The output voltage from the box is sinusoidal. (ii) The peak magnitude of the open-circuit voltage at the terminals is 5 V.
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