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A shunt-connected a DC motor has zero rotational losses and R A = 0. Assume that R A and R adj is constant [except in part (d)] and that is directly proportion to feild current. For VT= 200 V and P out = 2 hp. The speed is 1200 rpm. What is the effect on IA and speed if :a) The load torque doubles.b) The load power doubles.c) VT is changed to 100V and P out remains constantd) RA + Radj is doubled in value and P out remains constant?
an inventory control system that keeps track of what items are in stock when the level falls below a certain value ?
A mote draws an average of 200mA when "awake", 0.1mA when "sleeping", and 400mA (total) when "transmitting". Transmitting data takes 2ms, and sensor acquisition takes 1ms. If the maximum size battery available is 5000mAh
a. Neglecting resistance, determine the synchronous, transient and sub-transient reactances. b.If the machine is delivering 1.0 p.u. current at 0.8 power factor lagging at the rated terminal voltage when the short circuit is applied.
Design a circuit that satisfies the equation VOUT = 5 * ( VB - VA ). Draw the circuit schematic identifying supply voltages and show your work on component selection.
A motor's shaft is spinning at a speed of 1800 r/min. What is the shaft speed in radians per second
Design a simple BJT amplifier circuit for receiving the over-the-air HDTV signals. The circuit should have a voltage gain of 10-100, assuming your signal source (antenna) is connected to amp through a cable with an impedance of 75
The output of a communication channel is Y = X + N where X and N are independent, zero mean, random variables. X represents signal and N is noise. (a) Find the correlation coefficient between the input X and the output Y.
Given a sawtooth signal with fundamental frequency = 20 KHz as the input signal going into an ideal Highpass Filter with cutoff frequency fc = 60 KHz, what frequency components will be obtained at the output
It the resistors used are not ideal but have a ±5% manufacturing tolerance, what are the extreme output voltage and resistances that can result?
The maximum ratings for all resistors of this type are 250 (V) and ½ (W). What range of resistance values are limited by the maximum voltage rating of 250 (V), and what range of resistance values are limited by the maximum power of ½ (W)
An H-bridge allows a 4 A current pulse to the drive motor. What is the average current if the duty cycle is 75% and the pulse frequency is 2 kHz
A certain unity feedback control system has the closed-loop transfer function: T(s)= Y(s)/R(s)= (s/10+1)/((s/100+1)*(((s/20)^2)+s/20+1))) a) What is the estimated rise time b) What is the estimated overshoot
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