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Suppose that a shunt-connected machine operates at 800 rpm on the linear portion of its magnetization characteristic. The motor drives a load that requires constant torque. Assume that RA = 0. The resistances in the field circuit are RF = 50Ω and Radj = 25Ω. Find a new value for Radj so that the speed becomes 1200 rpm. What is the slowest speed that can be achieved by varying Radj?
For a transformer with a line voltage of 34.5 KV on the primary and a line voltafe of 480V. Calculate Vphase primary and secondary,P,Q, and S for each of the following transformer connections and loads.
The following functions describe the oscillations in electric circuits and the vibrations of machines and structures. Plot these functions on the same plot. Because they are similar decide how best to plot and label them to avoid confusion.
A 3-bit binary counter can be implemented with 3 T-flip-flops and some additional logic. Design the counter. Draw the block diagram (gates) and show the Boolean logic the input into each Flip-flop.
Calculate the load voltage, the load power, and the efficiency of the transmission system under the following schemes. a. 4:1 transformer at generator b. 4:1 transformer to load c. 1:4 transformer at the generator and a 16:1 transformer at the loa..
Design a circuit that outputs 0 volts when the input is above2.5volts, and outputs 5 volts when the input is below 2.5 volts.You may use power supply voltages of +10V, 0V and -10V. Be sureyour circuit will drive a low resistance load.
In a certain communications system a resonant-tuned circuit (tuned at 1200 kHz with Bandwidth = 15 kHz) is connected to the output of a non-linear amplifier (mixer). Find the frequency components at the output of the resonant-tuned circuit
In a MOS cascode amplifier, the cascode transistor is required to raise the output resistance by a factor of 40. If the transistor is operated at Vov = 0.2 V, what must its Va be. If the process technology specifies V'a as 5 V/um, what channel len..
Networks play an important role in telecommunications. Networking has a tremendous effect on people's everyday lives. Identify the necessary components required in designing a wire-based and wireless network.
consider a continuos LTI system with step response given by ys(t) = tu(t) - (t - 2)u(t - 2). A. Determine the laplace transform X(s) of the input signal x(t) = u(t). B. Determine the Laplace transform Ys(s) of the step response.
Interpreting frequency domain signal spectrum to time domain, A spectrum analyzer is connected to an unknown signal. The spectrum analyzer displays the voltage level of signals in volts vertically and frequency horizontally.
Describe the how the Hall Effect it is used to measure whether a semiconductor material is n-type or p-type. Sketch a diagram and show the critical measurements.
Find the current i1 through a branch connected to a node of an ac circuit, knowing that i1 enters the node and connected to the same node are three other branches carrying the currents: i2 = 14.6 sin(377t - 15°) A, leaving the node,
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