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The exciting current for a certain 50-kVA, 480-240V, 60 HZ transformer is 2.5 percent of rated current at a phase angle of 79.8 degrees. Sketch the equivalent circuit and phasor diagram for the no-load conditions and, assuming operation is in the step down mode, determine (a)the exciting current; (b)the core loss component of the exciting current; (c)the magnetizing current; (d)the core loss.
Show that it moves in a cycloidal path, and find the drift velocity, or the velocity of the center of the rolling circle along the z axis. If the electric field is 10^4 volts/cm and the magnetic field is 10^4 gausses, find the value of the drift v..
What is the resistivity of the wire? conductivity? Using the original dimensions of the wire, how much current can you pass through the wire until a 5V signal is degraded 5% or more?
If a 2 microfarad capacitor is charged to 12 volts and then connected across a resistor of 100 ohms: Determine the initial charge on the capacitor, initial current through the 100 ohm resistor and the time constant.
Flux weakening causes problems in both generators and motors. In generators, the effect of flux weakening is simply to reduce the voltage supplied by the generator for any given load. In motors, the effect can be more serious.
A certain coaxial cables is designed to handle extremely high voltages. In order to prevent dielectric breakdown the electric field (E-field) must be minimized.Calculate the correct value of B to A to minimize the electric field.
A "Clock" pulse for a flip-flop could be generated by manually filpping a switch from 0 to 1 and then back to 0. but switches such as those on the logic designer "bounce" when switched from on state to another.
a closed conical tank with diameter of 1.50 and height of 3.00 m, sitting on its circular base has 1.00m depth of water. Suppose the tank is upside down and is made to stand vertically that way using some device.
Assume that the radius of the sun is 6.955x10^8 m and that the mean distance of the sun from the earth is 149.6x10^9m A.what is the diameter of the solar disk on the SAM projection screen
an fm transmitter delivers to a 50 ohm antenna a signal voltage of V(t)= 75sin(10^8 t+2 sin 10^3t) determine(a) carrier frequency (b) Intelligence frequency (c) modulation index (d) Total Power in FM signal
A motor's shaft is spinning at a speed of 1800 r/min. What is the shaft speed in radians per second
You deposit 10% of your annual salary at the each of each year in a retirement account. F= Future worth A1= first annual deposit n=number of years g=geometric gradient F=A1(1-(1+g)^n(1+i)^-n/(i-g))(1+i)^n use Matlab to graph the function.
A Motorola 68000 microprocessor-based data acquisition system incorporates memory ( EPROMS and SRAMS), an Analog-to-Digital Converter (A/D), a Centronics Parallel Printer, and a very simple I/I Device made up of a single push-button switch.
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