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A three phase, 690V, star connected, 50Hz, four-pole wound-rotor induction generator is used for a new model wind turbine. It operates at a nominal speed of 1570 rpm when the rotor windings are short-circuited whilst generating rated power. It has the following parameters per phase (all quantities referred to the stator):
Rs = 0.2 Ω ,Rr = 0.13 Ω ,Xs = Xr = 0.45 Ω ,Xm = 36 Ω
(a) Derive the Thevenin equivalent circuit parameters (Vth, Rth & Xth) for this machine. (b) Find the value of slip at which maximum torque is developed. (c) Find the maximum torque developed when motoring and generating. (d) How much stator referred „external? resistance per phase should be connected in the rotor circuit such that maximum torque in generation mode occurs at a speed of 2,000 rpm
The signal transmitted by a Base Station has a power of 1 mW at a distance of 1 m from the transmitter. Measurements have shown that the propagation exponent for the path loss is n=3 up to a distance of 1 km and n=4 beyond that.
Tones Input In To An Amplifier, Suppose two tones are input in to an amplifier. The tones are pure sinusoids with one at frequencies 8GHz and the other at frequency 8.03GHz,(delta f =0.03GHz).
Laplace transforms enable interpretation and manipulation of different signals by viewing these signals as either time domain signals/pulse or else frequency domain representations
What are the distinguishing features of the response in the pass-band? What are the distinguishing features of the response in the stop-band? What is an all pass filter?
Analyse and Model Engineering Situations and Solve Engineering Problems using Laplace Transform
This document is shown a paper on Orthogonal frequency-division multiplexing with advantages, disadvantages and uses.
Interpret manufacturer's data sheet to select appropriate combinational logic devices for specific purposes
A signal is modulated by BPSK and transmitted over an AWGN channel. At the receiver, the bit error rate performance is 0.001
A battery is charged. The relationship between the charging current, i amperes and the time, t hours passed, is given by the formula:
"Divide by 3 clock with 50% duty cycle" is the most commonly asked ASIC design question. This solution gives a simple design in which only 1 counter is required which works only on positive edge of the clock.
In the presentation, the presenter, Mr. Rob Tucker discussed three types of disturbance mitigation responses or measures. List the three mitigation types and give a short definition of each of the mitigation type.
Bode plots were introduced in my second circuit analysis class, but I really didn't think it was important because it looked like an outdated tool no longer in use.
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