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A 3-kVA, 220:110-V, 60-Hz single-phase transformer yields this test data
open-circuit test: 200 V, 1.4 A, 50 W
short-Circuit test: 4.5 V, 13.64 A, 30 W
Determine the efficiency when the transformer delivers a load of 2 kVA at 0.85 power factor lagging.
Compare and contrast transmit and receive diversity. Describe how each diversity type lead to an improvement in system performance.
What is the sample period Ts?
A temperature transducer has the relationship R=200 + 10T where R is in ohms and T is in Celsius. The problem specifications are: Range is 30=T=50°C Resolution is 0.01°C Frequencies of interest are 0 to 100Hz Transducer dissipation constant is 20 mW..
For random ergodic voltage signal, I make a histogram of sample voltages and note that they form a Gaussian distribution. estimate the following moments over a number of samples taken at diffrent time points alont the voltage signal
Now, suppose that an initial voltage of 1V is present at the capacitor at zero time (t = 0). Will the behavior of the circuit when a step input is applied still yield an exponential rise or will the behavior be of some other type
A three phase, 25-hp, 440-V, 60-Hz, 1750 rpm, wound-rotor induction motor has the following equivalent circuit parameters: R1=0.20 ohms, X1=1.0 ohms, R2=0.15 ohms, X2=0.8 ohms, Xm=30 ohms. The motor is connected to a three phase, 440-V, 60-Hz supply.
A 50-cm-long copper wire with a cross-sectional area 1.2286x10^-10 m^2 is used to connect a voltage source and a device. What is the maximum voltage if the current is required to be not bigger than 5A
how big will be inductance of coil if it is connected in series with resistor 30 omega on AC circuit with input voltage with RMS value U1=(220+2*1.7) V and frequency 50 Hz if power factor of the circuit is 0.6
An amplifier output is being evaluated by a technician. The output is found to be a sine wave. The measured time lapse from one sine-wave peak to the next is 5 milliseconds.
An ideal p-n junction diode is reverse biased with a voltage of 30 mV. If the reverse current at this voltage is 1 pA and the area of the diode is 100 µm x 100 µm, what is the reverse saturation current density, JS
How are errors handled by the different windowing systems What different types of errors can occur and how do these windowing systems handle these different types of errors.
The receiver is designed to receive transmitted signals between 5 MHz and 25 MHz. High-side tuning is to be used. Determine the tuning range and tuning ratio of the local oscillator if the IF frequency is 400 kHz and 2 MHz, respectively.
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