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A 240 V,dc separately excited motor drives a constant-torque load at aspeed of 1500 rpm. The armature andfield resistance are 2 ? and 210? respectively. The motor draws a current of 20 A at givenload. Armature resistance method of speed control is employed tocontrol the speed of the motor. Calculate (a)the resistance that should be added to the armature circuit toreduce the speed by 40% and (b) the resistance that must be added to the armature circuit so that motor operatesat holding condition.
Design a BJT differential pair amplifier (balanced in, unbalanced out) that provides 20 dB differential gain and 40 dB CMRR. Assume b = 100, ro = 50 KW. Use dual dc power supplies +Vcc and -Vee.
Three amplifiers with power gains of 15, 22, and 7 are cascaded. The input power is 120 µW. What is the output power of the final amplifier stage
Given the spectrum X(f) of an analog signal x(t), sketch the spectrum of its sampled version x[n], assuming a sampling rate of 50, 40, and 30 Hz. (a) X(f) = rect(f/40) (b) X(f) = tri(f/20)
Design a Common Emitter amplifier with no bypass capacitor to obtain a voltage gain of -10 when Rin= 2k, Rload= 4k, VCC= 15V, VBE= 0.6V, and beta= 300. This amplifier requires an output swing of 4V peak-to-peak.
How much electrical charge is needed to raise an isolated metal sphere of radius 1.0 m to a potential of 1x10-6 V
illustrates how the forces can vary in problems of this type. A hiker, who weighs 739 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3250 N, and rests on two concrete supports
(a) GivenX=(00111)2 and Y=(00110)2 , compute the carrybits using the equations for a CLA. How many time units would youneed to compute all the carry bits and why (b). Compute all the sum bits usingthe aforementioned carry bits.
Consider a circuit that is connected to a phasor of 120V/0 degrees. The circuit feeds a 10 ohm resistor on the "hot" lead and then the circuit branches. One branch sees a 0.5A /60 degree phasor current source (oriented with "arrow oriented right)
Consider the signal x(t)=e^-at where a is a positive number. Determine the Fourier Transform of and plot both the magnitude and the phase angle as a function of the frequency.
consider an ideal amplifire with inverse feedback. explain what is meant by a virtual ground for both inverting and non-inverting connections
Design 3 stage amplifier with the following requirement input signal = 5 mV with R=10k ohms over all gain > 1000 power supply: Vcc = 5V, Vee = -5V Rin > 1 Mega Ohms Rout = 100 ohms 1st Stage BJT must use inverting
A constant electric field, E=12 V/cm, exists in the +x direction of an n-type gallium arsenide semiconductor for . The total current density is constant and is equal to 100 A/cm2. At x=0, the drift and diffusion current densities are equal.
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