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A 12-pole, 3-phase, 50 Hz, delta-connected induction motor draws 280 A and 110 kW under blocked-rotor test at rated voltage and frequency. Find the starting torque when switched on direct to the supply. Assume the stator and rotor copper losses to be equal under the blocked-rotor test. What would be the starting torque if the motor is started by connecting the phase windings in star.
The scale current Is is proportional to the junction area of a diode. A diode D1 with a rating of 3mA is connected in series with another Diode D2 with a junction area 27 times that of D1. 1) What will be the rating of the series combination
Write a report on the Chernobyl nuclear disaster. Identify the sequence of events that led to the disaster. In your opinion, can this accident occur in the United States? Why?
Compare the differences in the FFT result. Explain why even though the inputs to both FFTs are the same cosine waves, the shapes of the FFTs are different. Calculate, plot and compare the results of the 512-point FFT of the above signal.
consider the back to back cascade of an ideal C to D and D to C converter. Both have the same sampling rate fs. Suppose that the signal being sampled is: x(t) = cos(324*pi*t - pi/4) + cos(80*pi*t - pi/4)
What is the problem you are investigating and explain the issue, its history, the impact it makes locally
A load with a leading power factor of .9 draws 15A (rms) and 5kW from a 60 Hz source. Find the load impedance.
Determine the number of gates needed to implement an eight-bit carry-lookahead adder assuming that the maximum fan-in for the gates is four.
create the most fantastic holiday light show in your neighborhood. You have purchased 100 sets of lights with each set having 100 bulbs connected in series. Each bulb has 1 Ohms of resistance and requires 0.01A before it will turn on.
To learn the function and basic operation of the instruments comprising a test bench.
Describe one to two ways that you encounter and utilize electromagnetic radiation in your daily life. Note: Feel free to include both naturally occurring examples, as well as any man-made technologies.
A jet has 4 engines, A and B on the left wing, C and D on the right wing. Each engine gives a FAIL signal which is TRUE if the engine is broken, and is FALSE if the engine is working fine. The plane can fly as long as at most 1 engine on each wing..
A votage pulse of amplitutde 10V begins at 5-sec and lasts for 20 msec,which is short compared with the respponse times and time constants of the system.This impulse si then passed through and integrator.
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