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A 460-V 50-hp six-pole D-connected 60-Hz three-phase induction motor has a full-load slip of 4 percent, an efficiency of 91 percent, and a power factor of 0.87 lagging. At start-up, the motor develops 1.75 times the full-load torque but draws 7 times the rated current at the rated voltage. This motor is to be started with an autotransformer reduced voltage starter.
(a) What should the output voltage of the starter circuit be to reduce the starting torque until it equals the rated torque of the motor?
(b) What will the motor starting current and the current drawn from the supply be at this voltage?
Design a circuit to generate a 20 kHz train of pulses with width proportional to an input voltage in the 0 - 5V range. You may use digital components such as clocks, counters and comparators.
Three friends (Al,Bob and Chris) put their names in a hat and each draws a name from the hat.(Assume Al picks first, then Bob,then Chris). Find the sample space. Find the sets A,B,and C that corresponds to the events "Al draws his own name".
a sine wave signal (20 V PP) is connected to a 10k ohm resistor. Calculate the current through the resistor in terms of average,rms, and peak currents. what wattage rating should the resistor have
Design a digital security system for a four-door sedan car. There are sensors on all doors, hood, gas cover, and the trunk. When the car is locked, an alarm will sound if somebody tries to force open the door, hood, gas cover, the trunk, or tries ..
What is the transfer function of a filter? Describe how the transfer function of a filter can be determined using laboratory methods.
Design a 3-element, -40 dB side lobe level Dolph-Tschebyscheff array of isotropic elements placed symmetrically along the z-axis. Find the (a) amplitude excitation coefficients (b) array factor
If R2 = 2R1, R3 = 3R1 and the total power taken by the circuit is 480 watts. Calculate the power in each resistor
Two factors have a large influence on the dynamic response of the prime mover
Show the graph of the Gauussian probability density and corresponding cummulative probability function.
The torque produced by an external magnetic field is torque = D[5i,-3j] where D is a positive constant, and for this orientation of the loop the magnetic potential energy U = -mu cross B is negative. The magnitude of the magnetic field is 14D/IA
A spherically-symmetric charge distribution in free space (with a
The upper side frequency of an AM signal is 603 KHz. If the carrier frequency is 600 KHz, what is the intelligence frequency
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