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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.
Consider the financial aspects of the digital thermometer project. The project cost is estimated at $10,000. The total manufacturing cost of the digital thermometer, as called for in the specifications, total $150(that is, $95 parts
Midway between the plates, a proton and an electron are released. The electron is released from rest. The proton is projected perpendicularly toward the negative plate with an initial speed. The proton strikes the negative plate at the same instan..
Two bars of silicon, one n-type and one p-type, are uniformly doped so that ND(bar1) = NA(bar2) = 3.7x1016 cm-3. a) Without calculations: which bar will exhibit the larger resistivity and why
Four hundred grams of nitrogen gas (molecular weight=28g/mole) are stored in a 10-liter container. Set up an excel worksheet to determine the pressure of the gas (in atmospheres) as a function of temperature and volume, assuming nitrogen is an idea..
Using counters and state machines, use one slide switch to either read the switches that would set the duty cycle (count up to value) or cause the PWM to be running. If the slide switch is a ‘0' then the design allows the user to set the PWM valu..
Three cells whose open-circuit voltages are each V are connected in series. What is the open circuit voltage of the series connection If the same three cells were connected in parallel
Look at the resistor illustrated. Based on your knowledge of the resistor color code, what are the resistance value and tolerance of this resistor?
A 3-phase motor has coils wchich can be configured in a Y load. If each load phase has an impedance of 8+j6 ohms determine the power taken by the motor when supplied by a balanced 3-phase voltage source of 440V line to line.
The switch in a RC circuit is closed. If the resistance is 134462ohms, the capacitance 7.5 microF, and the applied voltage 18 volts, what is the (average) rate of change of the voltage on the capacitor, to the nearest tenth of a V/s, during the fi..
A logic function is given by F=?A,B,C,D,E(3,11,12,19,24,26,27,28,30). Use variable-entered K-map to find a simplified sum-of-product expression for function. Also find the corresponding product-of-sum expression.
Two 12-V batteries are being charged from a 16V generator. The internal resistances are 0.5ohm and 0.8ohm for the batteries and 2ohm for the generator. Find the currents flowing into the positive battery terminals
Bode plots were introduced in my second circuit analysis class, but I really didn't think it was important because it looked like an outdated tool no longer in use.
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