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Two stages are cascaded to result in an overall gain of 680 V/V.The loaded gain of the first stage is 36 dB. What must the gain ofthe second stage be in dB to satisfy this specification In V/V
A U.S Department of Energy report estimates that over 100billion kWH/year can be saved in the United States by variousenergy conservation techniques applied to the pump-driven systems.
A first order lowpass filter is operating in sinusoidal steady state conditions at a frequency of 2 kHz. It is determined that the positive peak of the output is delayed by 0.1 ms compared with the
A three phasestar connected alternator with synchronous impedance of 1+j5 ohms per phase is connected to an 11kV system. The alternator power outputis found to be 10MW and reactive power output as 3
A three phase star connected alternator has synchronous impedance of 1+j10ohms per phase. It is operating at a constant voltage of 6.6kV and its field current is adjusted to givean excitation voltag
One of the machines which has a synchronous reactanceof 50% and a resistanceof 1% delivers a power output in kW equals to 70% of its rated kVA. If the mf of this unit equals 1.2 times the terminal v
A 30kVA, 50 Hz, 4 pole alternator connected to an infinite bus at rated voltage has Xd = 1.00pu and Xq = 0.6 pu. For zero excitation find the output interms of rated power that the machine can deliv
A certain antenna has a radiation resistance of 51 ?, and an ohmic (loss) resistance of 10 ?. If a current of 2 A is driving the antenna, calculate the following: a) the power radiated. b) the power
In AM, spectral overlap is said to occur if the lower sidebandfor positive frequencies overlaps with its image for negativefrequencies. What condition must the modulated wave satisfy if weare to avo
1.) If the threshold of outage is β >0, the outage probability of one branch is what 2.) What is the outage probability of a system with M diversity branches where pure selection scheme is emp
Given a used area of 2016 ft2 and unused area of 2000ft2, (a) find the minimum number of 25-amper lighting branch circuits required for residence, (b) how many outlets are permitted on a lighting br
When a voltage v(t)=250 sin[314t-(pi/4)] is applied to a circuit,the current in the circuit is found to be i(t)=50 sin[314t-(pi/2)] amperes. Find the circuit elements,power & power factor.
a). Without calculating E(z), find its poles. b). Give the rule that you used in part (a). c). Verify the results of part (a) by calculating E(z). d). Compare the zero of E(z) with that of E(s).
The electric field intensity of a linearly polarized uniform plane wave propagating in the +z direction in seawater is E= 100 cos(10^(7) pi*t) V/m at z = 0. constant of emissivity = 8.854 * 10^(-12)
s(s^2-10+k(15s^2+2s+1)=0 Is the characteristic equation for a system in which K is a variable proportionnality factor. The system is known to be stable whrn K takes on certan values. for what range
The threshold voltage is eight times larger than the absolute value of the bulk potential, while the oxide is 20 nm thick. Find the doping density of the substrate and indicate whether the substrate
A silicon wafer has a uniform doping density of 4x10^19 atoms cm^-3 of Arsenic and 4x10^19 atoms cm^-3 of Phosphorus. Assume that all atoms are fully ionized at room temperature.
A capacitor, an electric resistance heater, and an impedance are connected in a parallel to a 120 volts, 60Hz system. the capacitor draws 50VARs, the heater draws 100 watts and the impedance coil dr
a capacitor, an electric resistance heater, and an impedance are connected in parallel to a 120 volt, 60 Hz. system. the capacitor draws 50 VARs, the heater draws 100 watts and the impedance coils d
A plumber is using an electric drill in a basement with a concrete floor.Assume his total body resistance from hands to feet is 1k ohm.The drill has a metal case that is connected to the ground wire
The Arrhenius equation is used to explain the dependance of the reaction rate coefficient, k, on temperature, T. Linearize the Arrhenius equation for the the temperature dependance of chemical react
Derive the transfer function for a system with an function u(t) and an output function x(t) described by the following differential equation; d^3x/d^5d^2x/dt^2+17d^x/dt+13=d^2u/dt+6
A 3-phase synchronous generator rated at 75 MVA, 13.8 kV (L-L) is connected to a power system that has a Thevenin equivalent of j0.23 per unit at 1.0 per unit voltage. The synchronous reactance of t
(a) Print the lowpass FIR filter coefficients and plot the frequency responses using MATLAB. Label and print your graph. (b) Determine the ripples in both pass-, and stop bands. Identify them on your
The field current of a 200kW, 230V shunt generator is 8A. When running full load at rated voltage. If the combined brush contact and armature resistance is 0.03 ohms. Determine the power generated a