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A 4-pole wound-rotor induction motor is used as a frequency changer. The stator is connected to a 50 Hz, 3-phase supply. The load is connected to the rotor slip rings. What are the possible speeds at which the rotor can supply power to this load at 25 Hz? What would be the ratio of voltages at load terminals at these speeds? Assume the stator and rotor impedances to be negligible.
Plot the torque-speed characteristic for this motor.
question an uncharged nonconductive hollow sphere of radius16.0cm surrounds a17.0microc charge located at the origin of
What is the RF bandwidth occupied by signal? What is the frequency range of the transmitted RF signal?
What characteristics of CMOS devices make them a desirable digital logic technology to use in portable electronic devices, such as MP3 players What device properties influence the operating speed and utility in portable electronic devices
Determine the capacitance required to establish a capacitive reactance that will match that of a 2-mH coil at a frequency of 50 kHz.
The capacitor in an RC circuit (R=10.0k Ohms and C=25.0uF) is initially uncharged. Determine the charge and current flowing in the circuit at 0.40 time constants (t=0.40 tau) after the circuit is connected to a 9.00 V battery.
Findthe following for an input of 120 VAC(RMS), 60 hertz, given a 17:1 stepdown transformer, and a full-wave bridge rectifier. Rload is 120 ohms. Round off to the nearest tenths place.
Bob enters a pizza shop and notices there are three different sizes of pizzas available. Sizes are given as the diameter of the pizza in inches. The cost of a pizza is based on the size. Bob would like to know which size of pizza has the lowest co..
At the receiver, demodulate the double side band signal S(t) = [cos(90*pi*t) + cos(120*pi*t)] * [cos(400*pi*t)], with the local carrier cos(400*pi*t). Design a low pass filter to suppress the carrier and plot the amplitude spectrum of S(t)
Plot the magnitude response, the log-magnitude response in dB, the phase response, and the impulse response of the filter.
a)How large a parallel resistor Ra mustbe placed in parallel with the D'Arsonval meter movement toextend its useful measuring range to 1A b)For the design completed in Prob. a determine themeasured current that flows when the D'Arsonval metermove..
Use the inverse Lorentz transformation (15.21) to re-derive the time-dilation formula (15.8). [Hint: Consider again the thought experiment of Figure 15.3, with the flash and the beep that occur at the same positions as seen in frame
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