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A four-pole induction motor drives a load at 2500 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-phase ac voltages. Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2 hp. If the dc-to-ac converter has a power efficiency of 88 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source.
The speed of a separately excited DC motor is controlled by asingle-phase semiconverter . The field current, which is alsocontrolled by a semiconverter, is set to the maximum possiblevalue. The AC supply voltage to the armature and field converter..
Given a battery rated at 10 amp-hours, how long could my differential amplifier (containing a circuit of three (3) 741 op amps) be powered by the battery, before the battery would fully discharge.
Develop an effective electrical maintenance program for a hotel complex comprised of a main hotel with 764 rooms, 12 two bedroom cottages, spa, swimming pool, three restaurants and sports bar lounge.
A 150-MVA 15/200-kV single-phase power transformer has a 0.018ohm resistance and a 0.075ohm reactance. The magnetizing impedance is j80 per unit. a.) Find the equivalent circuit referred to the low-voltage side of this transformer.
To expand further, we want to try out logic in interacting with users. Here is a sample of a game, using loops and decisions to allow a person to play rock-paper-scissors with a computer.
What are the advantages of a current controlled device over a voltage controlled device , and advantages of 4-20mA loop over a closed loop voltage
An ECG lead is oriented such that its electrodes are placed onthe body in positions that pick up an electromyogram from the chestmuscles as well as the electrocardiogram. Design a circuit thatseparates these two signals as well as possible
Design a second-order band-pass filter for a system with sampling frequency of 18 kHz that is tuned for f=5kHZ The filter should not have any sample delay (the numerator and denominator orders are equal) and should have a stability margin of 92%.
For a "Personal water craft" water is pumped from beneath the craft and discharged out the rear in a 1.25 inch diameter stream at a velocity of 75 ft/sec. Assuming that the craft and rider weighs 650lbs find the force acting on the craft and maxim..
Calculate the unit step response of the DT systems with the following impulse responses: a-) h[k]= u[k+6]- u[k-10] b-) h[k]= 3^k- u[-k]
A hard disk storesinformation magnetically on the surface of a circular disk. What is the approximate average area per bit of information on a hard diskdrive today
A 50 kVA, 6360V/230V transformer is tested on open and short-circuit to obtain its efficiency. The results of the tests are as follows. Open circuit: primary voltage, 6360V; primary current, 1A; power input, 2 kW. Short circuit: voltage across pri..
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