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A THREE PHASE, Y-CONNECTED, 60Hz, TWO POLES SYNCHRONOUS MACHINE HAS A STATOR WITH 5000 TURNS OF WIRE PER PHASE.WHAT ROTOR FLUX WOULD BE REQUIRED TO PRODUCE A TERMINAL (LINE-TO-LINE) VOLTAGE OF 13.2k
Suppose that the machining operation requires 1 kW, that the tool machine ihas 90 percent efficiency, and that the supply current is 14 A rms with a power factor of 0.8. Find the AC machine efficien
The heating element in a soldering iron has a resistance of 30-ohm. Find the average power dissipated in the soldering iron if it is connected to a voltage source of 117 V rms.
Derivation of J-V relationship for p-n junction Steps: a) Write the excess electron concentration on the p-side as a function of position b) Write the excess hole concentration on the n-side as a fu
A small ac motor, draws 100 VA from its 120-Vrms, 60 Hz ac source and consumes 50 W. Find the rms current the motor draws from the supply.
A three-phase Wye connected generator has Egline = 12470 V, Rp = 1 ?, Xs = 11 ?, and a full load line current of 600 A. Calculate Vterminal at a load power factor of 0.85.
Using the exponential formula for a charging circuit and assuming an initial voltage of zero volts across the capacitor, calculate the voltage across the capacitor at a. t = 1.5 seconds b. t = 2.5 s
The isotope's half-life is 5 days. The average energy of the beta particles is 0.35 MeV with an RBE of 1.5. Ninety percent of the beta particles are absorbed within the patient's body and 10% escape
An archaeologist finds the 14C in a sample of 3.0 g of material to be decaying at 107 counts per second. A modern 1.0 g sample of the same material decays at 151 counts per second. The half-life of
A summary of the nuclear reactions that power our sun can be written as 4p 4He + 2e-, with masses of 938.272 MeV/c2 for p, 3727.38 MeV/c2 for helium, and 0.511 MeV/c2 for electrons.
If a RAM memory has a 5-to-32 row address decoder and a 6-to-64 column address decoder, and eight pins I/O, what is the size of the memory
Upon being struck by 240 nm photons, a material ejects electrons with a maximum kinetic energy of 1.67 eV. a) What is the work function of this material b) What is the largest wavelength of a photon
a) At what time t1/2 have half the atoms decayed b) How many atoms have decayed at t = 40 ns c) Draw a graph of Nexc as a function of time. Show in the graph the lifetime, 1t1/2, 2t1/2, 3t1/2 and 4t
The surface concentration is fixed at N0=1.8e20/cm^2 when diffusing boron into a uniformly doped n-type substrate. The atomic diffusion constant for boron in Si at the temperature of 950 C is 3.0e-1
consider a continuos LTI system with step response given by ys(t) = tu(t) - (t - 2)u(t - 2). A. Determine the laplace transform X(s) of the input signal x(t) = u(t). B. Determine the Laplace transfo
Determine the output y(t) if the input to the system is given by x(t) = u(t) - u(t-2) using complex-domain (not time-domain) analysis techniques.
An interplanetary spacecraft far beyond Earth's orbit communicates with an equatorial ground station on the Earth. Calculate the maximum Doppler shift seen at X-band (8.4 GHz) due just to the Earth'
What minimum tracking bandwidth must the TDRS receiver possess in order to accommodate the Doppler effect (Hint: you need to include both the velocity of the LEO satellite and the velocity of the GE
What are the similarities and differences between the integrator and differentiator. What is a practical application where you would use an integrator or a differentiator.
If PH7=0, the servo rotates at 50% of max speed; otherwise, full speed. Make your own choice of PWM channel and clock. Write brief comments. Compile your program in CodeWarrior IDE and make sure it
Sketch a graph of the drain-source current, IDS, as a function of drain-source voltage, VDS, for an enhancement-mode NMOS transistor with a threshold voltage of 1 V. On the same graph indicate how t
Determine the value of gain, k which would lead to marginal stability. Using MATLAB, plot the step response of the closed loop system with this value of gain.
A silicon p-n-p BJT was designed to have doping levels of 1020 cm-3, 1015 cm-3, and 1017 cm-3 in different parts. a. Identify which doping level was intended for the emitter, for the base, and for t
A sinusoidal current is zero and increasing at t = -3.33ms; the next zero crossing occurs at t = 6.67ms. a) calculate T, F, and W. b) if i(0) = 25.98 A, Find i(t). c) By what angle does i(t) lead an