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A 100-kW, three-phase, 60-Hz, 460-V, six-pole wound-rotor induction motor develops its rated full-load output at a speed of 1158 r/min when operated at rated voltage and frequency with its slip rings short-circuited. The maximum torque it can develop at rated voltage and frequency is 310 percent of full-load torque. The resistance of the rotor winding is 0.17 O/phase Y; neglect any effects of rotational and stray-load loss and stator resistance.
a. Compute the rotor I2R loss at full load.
b. Compute the speed at maximum torque in r/min.
c. How much resistance must be inserted in series with the rotor windings to produce maximum starting torque? With the rotor windings short-circuited, the motor is now run from a 50-Hz supply with the applied voltage adjusted so that the air-gap flux wave is essentially equal to that at rated 60 Hz operation.
d. Compute the 50-Hz applied voltage.
e. Compute the speed at which the motor will develop a torque equal to its rated 60-Hz value with its slip-tings shorted.
The national chain wants the estimate to be within one time of the actual mean value. How large a sample should the researcher take to obtain a 98% confidence level?
Computer and software purchases are capital expenditures, even though the expected useful lifetime of computer hardware and software has decreased in recent years because of rapid technological change.
Prepare a Optical networks - Background about optical network and how it is work
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Determine how many units of each product to produce so as to maximize profit. For each unit of product 1, 1 unit of frame parts and 2 units of electrical components are required.
Temperature of outlet water, 25.3SoC Partial pressure of water in inlet air, 6.27 ton; and in outlet air, 20.1 torr The value for the diffusivity of water vapor in air is 0.22 cm2/s at 0°C and 1 atm. The mass velocity of air is taken relative to t..
It is desired to design a system to keep a 1-million-galon capacity water tank filled. The plan is to use a centrifugal pump to fill the tank with chilly water (10 oC) ground water from an aquifer, which is 0.8 mi away from the tank and 150 ft low..
What use are these measurements when trying to determine Controller parameters and what other measurements can be taken if one is trying to determine PID settings for a controller?
If the pressure inside is 1.0 atm, what downward force must the crew exert on the hatch to open it?
a small company is designing a new rigid commercial vehicle. you are tasked with developing a spread sheet that allows
Adopt a condensing power plant with a feedwater tank (MV) with the wiring diagram and information - High-pressure turbines are isentropic efficiency of 0.88.
you will explore a game through the lens set up by the weekly material.games of all kinds are the result of a process
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