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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 synchronous sequential circuit that has a single input X and an output Y. Y goes to 1 if x(t) = x(t - 2). At all other times Y is to be 0. Use Moore model and JK flip-flop to implement the circuit. (a) Make the state definition
A perfect electric dipole is directed along the z-axis. Inconventional spherical polar coordinates, at what values of the"dangle angle" q does the electric field have no z-component
In a 50 KVA, Y connected, 440 V, 3 phase, 50 Hz alternator, the effective armature resistance is 0.25 ohms per phase. Synchronous reactance is 3.2 ohms per phase. Determine at rated load and unity power factor,
How to decide the shortest possible clock period for a synchronous circuit with the flop-based clocking. What is the hold time of a register. How does the hold time constrain the circuit delays for a synchronous circuit.
Given the electric field E=4xux+2yuyV/m find the voltage between the points A(2,0) and B(0,2) integrating along: (a) straight line AB; (b) broken line AOB, where O(0,0).
Find (a) the electric susceptibility of cherry-flavored Jello, (b) the permittivity of cherry-flavored Jello, and (c) the electric flux density in cherry-flavored Jello for an applied electricfield of 1 kV/m. Assume cherry-flavored Jello is line..
When the beam is not broken, light from the transmitter hits the receiver and turns on the output transistor from the receiver. Their purpose is to detect objects as the objects break the beam. design a through-beam photoelectric sensor
A wire of radius 1.2 mm carries a current of 2.5 A. The potential difference between points on the wire 44 m apart is 8.6 V. What are the resistivity of the material of which the wire is made.
Derive the dynamic model and average value circuit of a buck converter assuming the ESRs of the inductor and capacitor are not equal to zero.
In a PCM system, the number of quantization levels is 16 and the maximum lsignal frequency is 4 kHz.;what is the bit transmission rate.
S = {c(k + jl) | k = 3, 1, 1, 3 and l = 3, 1, 1, 3 and j = square root of -1, where c is a constant. Determine the value of c to ensure a unit energy constellation. Sketch this constellation. Find d^2 min and label the constellation points with bi..
The Boston Celtics have won 16 NBA championships over approximately 50 years. Thus it may seem reasonable to assume that in a given year the Celtics win the title with probability p=0.32, independent of any other year.
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