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A 200 hp, 230 V, 500 rpm separately excited dc motor is controlled by a chopper. The chopper is connected to a bridge-diode rectifier supplied from a 230 V, 3 phase, 60 Hz ac main.
The motor chopper details are as follows:Ra= .04 O, La=.0015 H, Kb=4.172 V/rad/sec, fc= 2kHz
The motor is running at 300 rpm with 55 % duty cycle in the chopper. Determine the average current by the method of averaging and the electromagnetic torque produced in the motor.
Determine the maximum and minimum values of the magnitude response. How many peaks occur in the magnitude response in the frequencyrange from zero to 2π What are the locations of the peak and dips
A repeater with additive noise of 48μW and a power gain of 20 dB has 150μW of input signal power and 1.2μW of input noise. Calculate the input SNR, the output SNR, the noise factor, and the noise figure.
(a) Calculate on the axis of a charged ring. The ring lies in the z = 0 plane, has radius a, and carries uniform charge density λ C/m. (b) Repeat for a charged disk. The disk lies in the z = 0 plane, has radius a, and carries uniform charge density ..
A separately excited dc generator produces 400 v at 1500 rpm under open circuit conditions. Find the induced emf if the speed changes to 2000 rpm. Assume the flux is constant.
A 120 V lamp-dimming circuit is controlled by a rheostat and protect from excessive current by a 2 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse
Suppose the FCC allocates 300 kHz channels for a high quality video conference service. A service provider decides that this service requires 720 kbps (not including overhead and error control) for each channel.
a certain ideal voltage generator is characterized as v(t) = 40 sin 377 t . If this generator is measured with a DC voltmeter, the instrument reads 12 volts, what is the rms value of this voltage waveform
Let x(t) = cos(3/4(t+1/2)+1/4) a. Determine the frequency, the period of x(t) b. Given another signal, y(t)= sin(3/4(t+1)+3/8), is y(t) identical to x(t) Why
find the current that flows in a silicon bar of 10 micrometerlength having a 5 X4 micrometer cross section and having freeelectron & hole densities of 10^5/cm^3 & 10^15/cm^3 ,respectively, when a 1V is applied end-to-end. Use Mn =1200cm^2/VS; Mp=5..
The battery voltage is 20V Resistor3 a resistance of 20ohms. Resistor1 has a resistance of 30. Current flow is 250mA through the circuit. What is the resistance of resistor 3
It is decided to apply a Fast Hopping (FH) scheme on the above ASK system. The hopping is made over 12 channels of 100 kHz; or over 1.2 MHz bandwidth. The ASK signal hops 6 bands per bit period. Now a strong jammer randomly jams one of the 12 FH c..
Consider points P(2,4,3) and Q(1,-5,2) in three dimensional space: Find the position of vectors r1 and r2 for P and Q in terms of unit vectors i,j,k Determine graphically and analytically the resultant of these position vectors Hint: resultant vector..
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