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The magnetization graph taken at 1800 rpm of a 6 kW, 120 V, 50 A, 1800 rpm, dc generator is attached below. Field resistance is 20 ohms and armature resistance is .18 ohms. Find:
As a seperately excited generator, what is the range of no-load voltage Vt as R adj is adjusted from 0 to 40 ohms and the speed is varied from 1500 to 2000 rpm. Vf=120 V.
As a seperately excited generator Ia=20 A, speed= 1700 rpm, Vt= 106 V. Find If?
As a shunt generator running at 1800 rpm, find the critical field resistance, the no load terminal voltage when R adj=10 ohms and Vt when Ia= 20A and R adj=10 ohms?
A silicon p-n-p transistor has impurity concentrations of 5*10^18, 2*10^17, and 10^16 cm^-3 in the emitter, base, and collector, respectively. The base width is 1.0 um and the device cross-section area is 0.2 mm^2.
Surface integral for jet engine. The air-gas exhaust velocity from a jet engine varies linearly from a maximum of 300 m/s at the center of the circular exhaust opening to zero at the edges. If the exhaust diameter is 1.6 m, find thq exhaust flow.
Explain the operation of sequential logic devices and evaluate the output waveform in relation to the clock for QA, QB and QC in the subsequent circuit and show the binary sequence represented by these waveforms
Power Electronics - Diode, [Power electronics] The measured values of a diode at a temperature of 25 Degrees Celsius are: Vd=1V at Id=50A, Vd=1.5V at Id=600A. Determine (i) the emission coefficient n, and (ii) the leakage current.
The voltage and current at the terminals of the circuit element are zero for t 0 they are v = 90-90e^(-1000t) V i = 50e^(-1000t) mA A) Find the maximum value of the power delivered to the circuit B)
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.
Compute the inverse Fourier transform for X(ω) = cos 4ω. 5. A signal with the highest frequency component at 10 kHz is to be sampled. To reconstruct the signal, the sampling must be done at a minimum frequency of?
What is the maximum allowable value Xmax of X? The system is built with X-Xmax. An engineer argues that the host on the sort side of the bridge can use a minimum frame length shorter than 512 bits if they are talking to other hosts on the same sid..
A current source of 12 cos 2000t A, a 200-ohm resistor, and a 0.2-H inductor are in parallel. Assume steady-state conditions exist. At t = 1 ms, find the power being absorbed by the (a) resistor; (b) inductor; (c) sinusoidal source.
1- If the diameter of a spherical water droplet is 100.0 µm, how much energy is required to increase the diameter of the water droplet by 3.0 µm The surface tension of water is 1.0 x 10-3 J/m2. 2- A metal crystallizes in a face-centered cubic lat..
1) Determine the resistance range for resistors with the following color codes: a. Red-Orange-Orange-Silver b. Gray-Red-Red-Gold c. Yellow-Purple-Yellow-Gold 2) Determine the color code for the f..
the transformer is to be connected as an auto transformer to supply a load at 120 V from a 210 V source. What kVA load can be supplied without exceeding the current rating of the windings (assume an ideal transformer for this part)
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