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A shunt-connected motor has the magnetization curve shown in Figure. Ignore rotational losses in this problem. The motor is supplied from a source of VT = 240V and has RA = 1.5 Ω. The total field resistance is RF + Radj = 160 Ω.
a. Find the no-load speed.
b. A load is connected and the speed drops by 6 percent. Find the load torque, output power, armature current, field loss, and armature loss.
Water is being heated in a vertical piston-cylinder device. The piston has a mass of 15 kg and a cross-sectional area of 120 cm^2. If local atmospheric pressure is 99.5 kPa, determine the temperature at which the water will start boiling.
The furniture store manager rarely finances purchases, but will for Terry "as a special favor." The rate will be 10% per year, and because the desk costs $600, the interest will come to $60 for a one-year loan. Thus, the total price is $660, and T..
The manufacture of 6V -dry-cell flashlight battery says that the batter will deliver 15mA for 60 continuous hours. During that time the voltage will drop from 6V to 4V. Assume the drop in voltage is linear with time,
A thin-walled tube of 20-mm diameter passes hot fluid at a mean temperature of 45°C in an experimental flow loop. The tube is mounted horizontally in quiescent air at a temperature of 15°C. To satisfy the stringent temperature control requirements..
a) The number of turns on its high side. b)The turns ratio when it is used as a step-down transformer. c) The turns ratio when it is used as a step-up transformer.
There is a circuit with a 12V DC battery,500mH inductor, a 45 ohm resistor, and a switch all inseries. Suppose the switch has been closed for a very longtime when a wire is connected over just the battery.
a) Design an op amp circuit that will create an output voltage y(t) that is the solution to the differential equation y''(t) = 25 y, subject to the two initial conditions y(0) = 0.2 and dy(0)/dt = 0. You will need to use integrating op amps for t..
What are the filter gains for the stopband at the cut-off frequency and 500 Hz, and passband at 3000 Hz based on the plot of the magnitude frequency response. Print the highpass IIR filter coefficients and plot the frequency responses using MATLAB..
A mild structural steel beam has a solid squre cross section of 100mm and is simply supported by two supports 3mm apart. Calculate the dead load that can be safely supported when applied to the middle of the beam.
What are two of the major considerations that factor in the design of a substation. Give a couple of examples of station layouts where these factors are clearly demonstrated. What typical grounding materials are used in substations.
An oscilloscope shows the period of an ac waveform to be 3.5 horizontal divisions when the timebase control is set to "10 ms/Div". What is the measured period and frequency of the waveform
The following test data were obtained from short-circuit and open circuit tests of a 5-kVA, 2400-600V, 60Hz transformer. Voc=600V Ioc=3.34A Poc=484W Vsc=76.4V Isc=20.8A Psc=754W
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