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Suppose we have an ac current flowing through a coil wound on an iron core. Name two mechanisms by which energy is converted to heat in the core material. For each, how is the core material selected to minimize the power loss? How does each power loss depend on the frequency of the ac current?
A 75 hp, 60 Hz, 2300 V, 20 A, 2 pole, wye connected, design B induction motor with code K delivers rated horsepower at 3500 r/min. Assume the phase angle of the locked-rotor impedance is 75 degrees.
(a) What must the smaller resistor be adjusted to, if the larger resistor is 100 k-ohm (b) If the smaller resistor is to be formed by a pair of resistorsin parallel, with what resistor must a 2-k resistor be connected in parallel at the input to a..
How to control one lamp from six different places by using two, 2-way switches and four intermediate switches. ?
Suppose that we want to determine how many of the bits in a six-bit unsigned number are equal to 1. Design the simplest circuit that can accomplish this task.
A 20kW, 250V, self-excited dc shunt generator is driven at its rated speed of 1200rpm and it is delivering rated power at rated terminal voltage. Its armature-circuit resistance is 0.15-ohm, and the field current is 2 A.
Verify your design in MATLAB by obtaining the phase margin of the compensated system using Bode command.
The following heat engines produce power of 95,000 kW. Determine in each case the rates at which heat is absorbed from the hot reservoir and discarded to the cold reservoir. A Carnot engine operates between heat reservoirs at 750 K and 300 K.
As an Industrial Engineer you are asked to conduct a feasibility study to justify the consolidation of tools and gauge cribs and providing a dispatching system in a manufacturing plant so that tools and gauges can be delivered directly to the prod..
Find a possible series RL circuit equivalent to N.
a. Suggest a redesign of the common-emitter amplifier to increase the upper clipping voltage b. Suggest a redesign of the common-emitter amplifier to decrease the lower clipping voltage
Let S measure the time-dependent strength of a material under test and So is the initial strength as measured at the beginning of test. Prior tests and evaluations have suggested that the following stress-time relationship appears to work.
A 4 pole 50 kW dc machine has a value of Ea = 110 V at 1100 rpm. What is the induced voltage is the speed is increased 20%. Note: omega(w) = (2f*n)/60 where omega is in rad/sec, and n is in rpm
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