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The stator frequency of an induction machine is 50 Hz and the rotor circuit frequency is 5 Hz. What is the rotating speed in rpm for a 4-pole induction machine?
Using the Routh Hurwitz method, find the values of k for which the following polynomial has all its roots to the left of s = -1.
An analog system has a bandwidth of 10 MHz, a photodetector of = 0.5 A/W and ID = 1 nA, and a signal to noise ratio (SNR) of 30 dB. The receiver's temperature is 270 C and the load resistance is 50 .
A 10 kwatt, 480V , single phase 60Hz, 24 pole motor has an stator winding resistance of 0.1 ohm from line-to-neutral. The rotor is not a permanent magnet but a separately powered electromagnet (field wind-ings) that takes .5 A at 120 V.
It is operating at 50% of its rated load at a power factor of .5 leading, compute efficiency using both exact and approximate equivalent circuits as referred to the primary side. Tabulate the percent errors in the currents, voltages, powers
A 4800/480 volt, single phase transformer is rated at 75KVA. test results performed for rated power showed the following. short circuit test V=80v, P= 2470W, I= Rated current open circuit test V= 480v, I=4Amp, P=616W
(c) Use a single 4-to-1 multiplexer with an active low enable and an active high output and a minimum of additional gates. Show the function expansion both algebraically and on a Karnaugh map.
Include the unused states in the design, arranging the circuit to switch from any unused state to the 'main sequence' within one clock cycle, and show the state diagram that applies here. Clearly show all the steps of the design procedure used.
A transmission line has the following per-unit-length parameters: L = 0.5 H/m, C = 200 pF/m, R = 4.0 /m, and G = 0.02 S/m. Calculate the propagation constant and characteristic impedance of this line at 800 MHz. If the line is 30 cm long
The voltage across a resistor is given by Ohm's Law: V=R I. Write a program that asks for resistance R in ohms, and current I in amps for several resistors, then calculates and displays the voltage across each resistor.
A video signal contains light variations that change at a frequency as high as 3.5 MHz. What is the minimum sampling frequency for A/D conversion?
A coil with an impedence of 64.1 angle 51.4 degrees is connected in series with a resistance 22.5 ohms. The combination is supplied by 120 V source. Determine the coil and resistor voltages and the overall power factor.
Suppose a 12-V battery bank rated at 200 Ah under standard conditions needs to deliver 600 Wh over a 12-h period each day. If they operate at -10 Celsius, how many days of use would they be able to supply
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