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An automatic starter circuit is to be designed for a shunt motor rated at 20 hp, 240 V, and 75 A. The armature resistance of the motor is 0.12 W, and the shunt field resistance is 40 W. The motor is to start with no more than 250 percent of its rated armature current, and as soon as the current falls to rated value, a starting resistor stage is to be cut out. How many stages of starting resistance are needed, and how big should each one be?
What is the rotational speed of the motor at no-load conditions - Assuming no armature reaction, what is the speed of the motor at full load?
Two components of linear distortion produced by transmitting asignal through an LTI (linear time invariant) system: Amplitude distortion - the frequency components of the input signalare transmitted through the system with different amounts of gain..
Use MATLAB to obtain a Bode plot of the transfer-function magnitude for R1 = 9 k Ω, R2 = 1 k Ω, and C = 0.01μF. Allow frequency to range from 10Hz to 1MHz.
A lighting load operates from a 208-V 60-Hz supply and is rated 1.0 kW with a power factor of 0.9 lagging. A 40-µF capacitor is connected in parallel with this load. Calculate the total power factor and the percent change in line current.
A microcontroller manufacturer, Agduino, offers a single product which is produced at two different plants. The first plant located in college station produces 2/3 of the microcontrollers. The remaining microcontrollers come from Austin.
Design a common emitter, voltage divider biased amplifier. The input signal has a frequency range of 20Hz to 50 kHz. The input voltage is 20mVpk, the beta is 300, and the source voltage is 12V.We need the ac output voltage (Vc) to be approximately 6V..
(1) If you have a transformer that is not in a circuit, how can you tell/determine what the ratio is (2) How do you tell if a diode is forward or bias. How much voltage is assumed dropped across a forward biased silicon diode. Reversed biased sili..
Using the symbols we've learned in class (standard symbols used universally), draw a schematic showing the circuit of a 12-V car battery (represented as a voltage source connected to a light bulb (represented as a resistor).
Using the Nyquist stability criterion, determine the stability of the closed-loop system.
The current in the bulb depends on the time t according to the relation I = (0.807 A) sin [(272 rad/s)t]. (a) What is the frequency of the alternating current (b) Determine the resistance of the bulb's filament. (c) What is the average power deliv..
A 100uf capacitor is initially charged to 100V. We want 90% of the initial energy to remain after 1 minuet. What is the the limit on the leakage resistance for the capacitor
A triangular periodic signal g(t) has an average value of zerovolts, peak to peak magnitude of 20 volts and a period T = 2seconds. Derive the average power of this waveform. Derive its rms value.
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