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Consider a 3 phase, 2 pole induction machine. Neglect the stator windings resistance and the leakage inductance. The rated voltage is 208 V (line-line, rms) at 60 Hz. Lm=60 mH, and the peak flux density in the air gap is 0.85T. Consider that the phase-a voltage reaches its positive peak at ωt=0. Assuming that the rotor circuit is somehow open-circuited, calculate and draw the following space vectors at ωt=0 and ωt= 60 degrees: vs, is, and Bms. Draw the phasor diagram with Va and Ima. WHat is the relationship between Bms, Ims, and Im?
Current and average power delivered to the load, A load has a 20 ohm resistor and a 4 henry inductor connected in series. It is connected to a power source with v(t)= 100cos50t
Using a 500 Ohm resistance, design an RC low-pass filter that would attenuate a 120-Hz sinusoidal voltage by 20 dB with respect to the DC gain.
The resistance is .4 ohm for each transmission wire connecting the motor source. If the motor was operating at 100% pf and eff and the cost of electrical power was $.10/kWh, how much can be saved each year if the motor was wired to the 240.
For the equation F(a,b,c,d) = ab'c' + abc'd + abcd + a'bcd + a'bcd', determine all prime implicants and all essential prime implicants: (a) using a K-map, (b) using the tabular method.
A. Two machinery options are described below. Calcuate the present value of each of the items specified. Assume an interest rate of 6% and a useful life of 8 years. Show all the necesary work to calcualte value.
A 160-ft-diameter parabolic antenna is driven by a 10-W transmitter at 4.3 GHz. Calculate its effective radiated power (ERP) and its beamwidth.
The temperature decreases by 33.8 C°. Determine the fractional decrease L/(LSilver + LGold) in the rod's length, where LSilver and LGold are the initial lengths of the silver and gold rods.
In a typical AC circuit, the supply voltage is 10 VPK and frequency is 60 Hz. If the current through the system is 2 APK with a phase angle of 60o, then the power dissipated by the source is
We wish to implement the Johnson counter as a Moore machine using three (3) D flip-flops. Give the simplified excitation equations for each of the flip-flops, and draw the circuit. There is no input in this system, as the counter advances on every..
A MOSFET transistor is being used as a converter switch in a 100v system. It is switching at 50 KHz and has a linear transition time of 3us. The full load current is 40 amps. - How much average power is being wasted due to switching
suppose we use a 32-bit unsigned fixed-point representation with the binary point to the left of the most-significant bit of the 32-bit number. (We'll have a range of 0 - almost 1.) What is the resolution of this representation
A 480 V permanent magnet ac motor is consuming 10 kW at power factor 0.80 lagging. Its speed is 1800 rpm. The winding resistance is 0.5 ohms per phase. Core losses are 100 W. Mechanical losses are 250 W. Stray losses are 1.5% of the input power
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