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A hypothetical alternator in an automobile has an armature 15 cm long, diameter 8 cm, and has slots 0.5 cm deep filled with windings. The radial field is provided by coils in the stator to obtain a flux density of 0.1 Wb/m^2 so that there is only on south and on the opposite side the north pole. The coils on the rotor, 10 turns per coil, are connected in series through the slip rings so that at any instance of time there are 5 coil sides under each pole. What is the dc voltage from a full wave rectifier if this rotates at 1000 rpm?
In transformer designs, often you can find an air gap in the core. In all the electric machines, there is an air gap between the stator and rotor. In both cases, flux will go through both core material and the air gap.
The resistance of the shunt field winding and the resistance setting of the shunt field rheostat of a separately excited generator are 10.26 ohm and 14.23 ohm respectively. The field circuit is connected to a 120-V DC source.
A cube with an edge of length 2 mm is charged to -1.2 C. Find: a)ρv , if the charge is distributed uniformly over its volume ; b) ρs , if the charge is distributed uniformly on its surface; c)ρL , if the charge is distributed uniformly on the edges o..
Adding dopants to a sample of silicon is found to reduce the Hall coefficient by a factor of 10 and increase the conductivity by a factor of 5. What effect has this dopant addition had on the mean free path
what is the new resistance level of a copper conductor wire if the lenght is changed from 200 ft to 400 ft, the area is changed from 50,000 CM to 0.10 in ^2 and the original resistance was 7 ohms
Find the characteristics equation and the corresponding roots for the following ODEs and identify its case a) y" + 6Y' + 9y=0 b) 10y" + 18y' +5.6y=0 c) 10y" + 50y' + 65y =0 Slove the intial value problem a) problem 2a) with y(0)=2 and y'(0)=-5
Determining how to use the function fft to find the DFT coefficients X[k] of x[n] in Matlab. Also, how would you plot the magnitude of X[k] in Matlab?
"Divide by 3 clock with 50% duty cycle" is the most commonly asked ASIC design question. This solution gives a simple design in which only 1 counter is required which works only on positive edge of the clock.
Write a 4-bit up counter. Your counter has a asynchronous clear and when the clear is activated, the counter is reset to 3. The count range is from 3 to 9.
An LED with a rated range of VF = 1.4 V to 1.8 V at IF = 20 mA is connected to a driver circuit with a peak output of 14V. What value of current-limiting resistor would be needed to limit the LED current to a maximum value of 20 mA
Discuss the sequence of actions that occur in the operation of the control system for a traffic light that includes sensors in the roadbed. Indicate which actions are time-driven and which actions are event-driven.
A high-voltage transmission line connects a city to the power plant. It consists of two aluminum wires, each with resistance of 4.0 Ohm. The transmission line delivers to the city 1.7x105 kW of power at 2.3x105 V. What is the current in the transm..
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