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An oil-filled transformer has a c.m.r. of 500 kVA which allows it to run continuously in an ambient of 35°C with an oil temperature rise of 50°C. The transformer has a time constant of 1.5. hours and the ratio of copper losses to iron losses at c.m.r. is 1.5:1.
After switch-on, the transformer supplies a load of 600 kVA for one hour and the load then rises to 750 kVA. Calculate the period of time that the transformer can supply this load without exceeding its rated maximum temperature. Sketch the heating curves for the two loads.
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A 10 Bit Ripple Counter has a 256KHz Clock Pulse. Assume thatthe counter starts at zero. What will be the count in Hexadecimal after 1000 pulses
Check the stability of the resulting design using CAD modeling over the frequency range of 1-12 GHz, or by using stability circles at a few frequencies.
two resistors with nominal values of 4.7K ohm and 10K ohm, are used in a voltage divider with a +15V supply to create a nominal +10V output. Assuming the resistor values to be exact, what is the actual output voltage produced
Fins are used to enhance the cooling of an object. Fins are manufactured in a wide variety of shapes and sizes, and for a mass-product, it may be beneficial to optimize the shape of the fin. find the dimensions of the fin that achieve a maximum
Knowing that a beam of the cross section shown is bent about a horizontal axis and that the bending moment is 6 kN.m, determine the total force acting on the shaded portion of the web.
A digital communication link carries binary-coded words representing samples of an input signal xa(t) = 3 cos 600pt + 2 cos 1800p.The link is operated at 10,000 bits/s and each input sample is quantized into 1024 different voltage levels.
This item covers Modules 5-8. Scan, handwrite answers and upload solutions. Show all required calculations for full credit.
Question 1) A shunt machine has armature and field resistance of 0.04 ohm and 100 ohm respectively. When connected to a 460 V d.c. supply and driven as a generator at 600 rev/min, it delivers 50 kW. Calculate its speed when running as a motor and tak..
1three resistors r1 r2 and r3 are connected in series and a supply voltage of 240 v. if r2 2r1 r3 3r1 and the total
A candidate material for a turbine blade application oxidizes by diffusion of metal atoms through the oxide to the metal surface, where metal and oxygen react to form the oxide. After 10 hours at 550*C, an oxide layer 8µm thick has formed.
Compare the by hand solution and the PSPICE simulation for a voltage amplifier which has an input resistance of 10kohms and an output resistance of 100ohms, and a gain of 100V/V. The voltage amplifier is capacitively coupled to a voltage source.
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..
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