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With a separately excited 2-kW DC machine, which has the following parameters, draw the capability curve in the first quadrant and the second quadrant of the torque-speed plane. Also in the plane, simultaneously plot the electric power to (from) the machine, along with the armature voltage, and the field current according to the torque. Because of the commutation problem, the field flux can be reduced down to one-third of the rated value. It is assumed that the field flux is proportional to the field current.
1. We consider a Rayleigh fading signal. Suppose that a single branch receiver has a 10% chance of being 5 dB below a certain SNR threshold γo.
The user of your program will know the employee's name and the gross pay for the employee. Each employee has the following deductions taken from his gross pay: Federal Income Tax: 15% State Tax: 3.5% Social Security + Medicare Tax: 8.5% Health Ins..
The temperature decreases by 33.8 C°. Determine the fractional decrease L/(LSilver + LGold) in the rod's length, where LSilver and LGold are the initial lengths of the silver and gold rods.
a) An Si p+-n junction has A=1/100 cm^2 and N(donor)=10^15/cm^3 on the n side. Calculate junction capacitance with reverse bias of 10V. b) An abrupt p+-n junction is formed in Si with donor doping of Nd=10^15 / cm^3.
how do we determine the direction of current in a multiloop circuit with more than one source of e.m.f?
If the voltage across the current through the series combination ofa resistance and an unknown energy-storage element are v =200cos(10^(2)t + 60°) V and i = 5.547cos(10^(2)t + 93.69°)mA,
Calculate each (3) superposition voltages at VO. The sum of these voltages will be VO with all 3 supplies connected.
a.) Write signals as the real part of the sum if rotating phasors. b) sum of the counter-rotating phasors c.) Plot the single sided amplitude and phase spectra for this signal d.) plot the double-sided amplitude and phase spectra for this signal.
The RS-232 serial port on a personal computer is transmitting 2400-bit/sec data using a polar NRZ line code that has a peak value of 12 V. Assume that binary 1's and 0's are equally likely to occur.
A single-phase transformer has a voltage regulation of 5%. The input voltage of the transformer is 120V, and the turns ratio N1/N2 is 2. Compute the voltage across the load V2.
We will weigh objects by a strain gauge or R = 120 Ohms, GF= 2.02 mounted on copper column of 6-in. diameter. Find the change in resistance per pound placed on the column. Is this change an increase or decrease in resistance
1. write a short technical report on one of the subsequent digital communication techniques-a. frequency division
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