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A 3-phase, 440-V,4-pole, 60Hz induction motor has maximum power Pmech=220hp and a maximum torque Tmech= 1140 N-m. Use simplified circuit and ignore stator impedance.
(a) Find the slip at the maximum developed torque.(b) If we would like to get the maximum torque at starting (s=1), a method is to add more resistance to the rotor, R2,new=R2,old + Rextra, while the rotor reactance X2 stays the same.
what is the force to the nearest tenth of a mN on a charge q=0.71micro coulums at the point p a distance of r=0.22 meters and what is the magnitude of the electric field to the nearest tenth of a N/C
Write the VHDL architecture file for the Y(5) output only for a 8-to-1 demultiplexer. The inputs are D, the selects S0-S2, and the ouputs Y(0)-Y(7). the select lines are bit_vector types, the data is bit type and the outputs are bit_vector types.
In a vessel with a volume 3 m3 you put 0.03 m3 of liquid water and 2.97 m3 of water vapor so that the pressure is 101.33 kPa. Then you heat the system until all liquid water just evaporates. What is the pressure and temperature in the vessel at th..
Construct a Phasor Diagram to represent the source voltage, source current, voltage drops, VR, and VL across the resistor and the inductor. The diagram does not need to be drawn to scale. However, the values of the items represented must be includ..
what is the shortest possible line length that would exhibit the desired reactance at its input?
An induction motor has an output or shaft power of 30 kW at 86% efficiency. For this operatingcondition, stator copper loss = rotor copper loss = core loss = mechanical rotational losses. Determine the slip.
a) The input signal to an amplifier is -20 dBm. What is the input signal power in mW. Given the input signal and noise power in parts (a) and (b), what is the input signal-to-noise ratio in dB.
A four pole DC machine has a wave winding of 300 turns. The flux per pole is .025 webers. The DC machine rotates at 1000 RPM. Determine the generated voltage and the kW rating if the current through the turn is 25 amps.
Compare this spectral distribution with that of the radiation received on the surface of the earth at AM1.5. Briefly explain the causes of the difference between the emitted radiation of the core of the sun and the received radiation at the earth'..
A y polarized UPW motion in + x direction in free space has a maximum value of 20 (V/m) at a point x=1.5 (m) with the next adjacent minimum at x=2.75 (m) at time t=0 Obtain the wavelength and the frequency of the wave.
Pulse width modulation (PWM) is used to control dc voltage to an electric heater. The supply voltage is 12 Vdc, and the heating element is modeled as a 1 resistance. (a) Calculate the average power delivered to the heater when the voltage is switche..
A penstock is used to bring water from behind a dam into a turbine. the penstock is 6m in diameter and moves water at a rate of 500 m^3/s. Compute the mechanical power entering the turbine.
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