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A constant current source of 2 mA is placed across a fully discharged capacitor of 100 F. In the time period before the capacitor reaches breakdown voltage, what is the time rate of change of voltag
A network connected between terminlas a and b consists of two parallel combinations that are in series. The first parallel combination is composed of a 10 OHM resistor and a 19 OHM resistor.
The number of cell phones recycled or refurbished instead of being sent to landfills is increasing by about 30% per year since 2004. In 2008, 5.5 million cell phones were recycled or refurbished. (a
Two dc motors are compared. the first one is a 4hp dc motor which draws a current or 0.7A when the field is connected to a 150V source. the second, a 600 hp motor draws a field current of 5A when th
Two bars of silicon, one n-type and one p-type, are uniformly doped so that ND(bar1) = NA(bar2) = 3.7x1016 cm-3. a) Without calculations: which bar will exhibit the larger resistivity and why
A 500V shunt dc motor has a nominal armature current of 40A, and operates at 1200 rpm. if the armature resistance is 0.25 (ohm), calculate The valve of a starting resistor limiting the initial armat
three single-phase transformers rated at 250kVa, 7200V/600, 50Hz, are connected in wye-delta on a 12470V, 3 phase line, if the load is 450kVA, calculate the current in the incoming and outgoing tran
calculate the losses in the transformer under these conditions. losses and efficiency when the transformer delivers its rated power to a load having a power factor of 90%
An induction motor absorbs an apparent power of 500 kVA at a power factor of 75%, calculate the active and reactive power absorbed by the motor, what purpose does the reactive power serve
A copper busbar 10cm wide, 5 mm thick, and 10 m long carries a current of 2kA, Calculate the voltage drop if the temperature of the busbar is 120 degree. What is the power loss per meter
The axis of the cylinder is along the z axis, and the electrons are moving with a velocity vector v in the positive z direction. The velocity of the electrons is 0.1c where c is the speed of light
A residential four-wire system supplies power at 220V rms to the following single-phase appliances: On the first phase, there are ten 75-W bulbs. On the second phase, there is a 750-W vacuum cleaner
However, for short-time operation, a delta connection can be used at the nominal wye voltage. Find the ratio between the power delivered to the same motor in the wye and delta connections.
Design a circuit that has 4 inputs, WXYZ, and two outputs, f and g, where W is the most and Z is the least significant bit. The output f is asserted whenever the two-bit number WX is greater than th
in investigating the ideal gas law experiments are to be run at four different pressure and three different temperatures . A) How many exprimental conditions are to be studies B) If each experment is
A flashlight battery with a voltage of 1.2 would be considered. During servicing, Ni-Cad batteries are normally overcharged to of the rated amp-hour capacity. What is done in an airplane in flight to
design an arithmetic incrementer/decrementer circuit. Your circuit will recieve a 3-bit binary number (A) as input to produce an output which is either A+1 or A-1 depending upon the command input (I
Consider the 1D system whose input-output equation is given by g(x) = f(x)*f(x), where * denotes convolution. a) Write an integral expression that gives g(x) as a function of f(x). Hint: Convolution d
If the application program creates a message of 150 bytes and each layer (including the fifth and the first) adds a header of 20 bytes to the data unit, what is the efficiency (the ratio of applicat
Determine whether the following signals are periodic. If they are, find the smallest periods (fundamental periods). a) f(x,y) = sin (2 pi x) cos(4 pi y) b) Discrete signal: f(m,n) = sin ( pi * m / 5)
if the energy strored in the fully charged battery is used to lift the battery with 100% efficiency, what height is attained. Assume that the acceleration due to gravity is 9.8 m/s^(2) and is consta
A balanced three-phase inductive load is supplied in steady state by a balanced three-phase voltage source with a phase voltage of 120Vrms. The load draws a total of 10kW at a power factor of 0.9.
Write a MATLAB program that will allow a user to type the specific heat of a value in calories per gram degree Celsius. Display the converted value in units of British thermal units per pound-mass d
write a MATLAB program that will allow the user to type the power in watts, the mass of the object in kilograms, the height the object will be raised in meters, and the time it took to raise the obj