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for a motor rated Vrms=230v P=300w pf=0.75lagging,calculate the capacitance C needed to improve the power factor to unity assuem frequency =50Hz sketch current and voltage phasors.
For much of the last century, the annual growth rate of energy utilization in the world was 3.5% per year. At present, the rate of global energy usage is approximately 15 TW. When considering only coal, oil, and gas.
Each phase of the load consists of an impedance of 30 + j40 *. Find the linetoneutral voltage phasors, the line-to-line voltage phasors, the line-current phasors, the power, and the reactive power delivered to the load.
A DC motor, fed trough a four-quadrant chopper, works as a motor in thethird quadrant (reverse motion). The main data are Vo =120V, Ra = 0.5-ohm, La = 2.5mH, rated currentIan = 20A; rated speed nn = 3000rpm; separate excitation.
A Barangay power station supplies 60kW to a load over2,500 ft, 100 mm2, two conductors copper feeder, theresistance of which is 0.078 Ω per 1000ft. The bus bar voltageis maintained constant at 600 V. Determine the load current.
One step in decoding a simple code without knowing the coding scheme , involves counting the number of occurrences of each character. Then, knowing that the most common letter in English is "e" the letter that occurs most commonly
1. Derive the sensitivity for a voltage and current source excited Wheatstone bridge. 2. Show the balance condition for a Wheatstone bridge is also true in the sinusoidal steady state if the resistances are replaced with complex impedances.
The maximum oven temperature to be maintained by the conventional type of thermostatic control is 290 degrees Celsius, the kitchen temperature may vary from 15 to 33 degrees Celsius, and the average heat transfer coefficient between the oven surfac..
Vo(t) = RC (dVi(t)/dt). Suppose you have a triangle waveform as input to the differentiator with 100pF capacitance and 100 Ohms. The peak to peak voltage of the triangle waveform is 10Vpp and its frequency is 100k Hz.
Look up the Bell 103 modem and answer the following questions: (a) What year was the modem introduced(b) What baud rate did the modem operate at (c) What is baud rate How is it different than bit rate
1-mH inductor carries a current: i(t)=50*t^2*exp(-2*t) inunit of mA. Determine the voltage, power, and energy of the inductor as a function of time.
An LTI system has an impulse response h(t) = e^(t) u(-t),where u(t) is the unit step signal. (a) Give a differential equation description for the system. (b)Suppose that an input signal is given as x(t) = e^(-t) u(t). Determine the output response.
A 2.19 x 10-2-kg block is resting on a horizontal frictionless surface and is attached to a horizontal spring whose spring constant is 120 N/m. The block is shoved parallel to the spring axis and is given an initial speed of 10.5 m/s
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