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A three phase 12 pole, 220-V, 60- hz ,50 hp squirrel cagemotor , operating at rated load, has a speed of 595 r/min, anefficiency of 89 percent ,and a power factor of 81 percent lagging.The locked rotor current and locked rotor torque at a rated voltage and rated frequency are 725A and 120 percent rated torque,respectivtively. Determinea) rated line currentb)rated torquec) minimum voltage required to obtain a blocked- rotor torque equal 70 percent rated torqued) auto transformer bank ratio required to provide the minimumvoltage in (c)e)stator current at blocked rotor with auto transformer incircuit;f) corresponding input current to the transformer when starting the motor at the voltage in (c)
The machine has 180 slotes and has a twolayer winding with 3-turn coil. Each coil spans 15 slotes, the coilbeing connected to 600 groups.The armature diameter is125 c.m. and core length 45 c.m..
Consider a PCM-TDM system in which 24 signals are to be processed. Each signal has a baseband bandwidth of 3 KHz. The sampling rate has to be 33.3% higher than the theoretical minimum, and 8 bits are to be used.
A silver(Ag) electrode and a zinc(Zn) electrode are placed in the same electrolyte and connected to a voltmeter in a voltaic cell. The resistance of the volt bridge and electrolyte solution is 5k Ohm.
a). Without calculating E(z), find its poles. b). Give the rule that you used in part (a). c). Verify the results of part (a) by calculating E(z). d). Compare the zero of E(z) with that of E(s).
A piston-cylinder device initially contains 1 m of nitrogen gas at 400kpa and 27 c. A resistance heater is turned on inside the cylinder which passes 70 kj of electricity to the nitrogen gas.
Suppose that the source charges of the two previous problems are present together. The potential at infinity is defined to be 0. a. Is the potential at the point (0.5, 0.5, 0.5) positive, negative, or zero b. Is the potential at (4, 4, 4) positive
a sequential circuit has one input (X) and one output (F). The circuit examines groups of four consecutive inputs and produces an output F=1 if the input sequence 0101 or 1001 occurs. The circuit resets after every four inputs.
The following functions describe the oscillations in electric circuits and the vibrations of machines and structures. Plot these functions on the same plot. Because they are similar decide how best to plot and label them to avoid confusion.
The cylindrical coaxial cable with the cross section shown below, has inner and outer radii of 5mm and 15mm respectively. The dielectric parameters are; er=2, signma=5*10^(-10) S/m and Ur=1
How to find the damping ratio and undamped natural frequency given a 2nd-order differential equation.
consider a continuos LTI system with step response given by ys(t) = tu(t) - (t - 2)u(t - 2). A. Determine the laplace transform X(s) of the input signal x(t) = u(t). B. Determine the Laplace transform Ys(s) of the step response.
The 8086 Microprocessor Operating Systems and System Interrupt services, Please help me write a program that will display the hex code for any key, or key combination, that is pressed on the keyboard.
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