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From a three-phase, 60-Hz system, through a motor-generator set consisting of two directly coupled synchronous machines, electric power is supplied to a three-phase, 50-Hz system.
(a) Determine the minimum number of poles for the motor.
(b) Determine the minimum number of poles for the generator.
(c) With the number of poles decided, find the speed in r/min at which the motor-generator set will operate.
The vessel is 4 m internal diameter and 20 m long. Estimate the minimum wall thickness required to resist this pressure, for the cylindrical section and the heads. Take the design pressure as 12 bar and the maximum allowable stress for the materia..
Determine the current needed in the coil to produce a flux density of 1 T in the center limb, if the excitation coil has 500 turns.
Calculate the bubble-point temperature, evaluate f for the first guessed value of T, and then vary T in increments of ± 5°C until the value of f changes sign from its initial value - Briefly explain why the variations in bubble-point temperature f..
An effluent disposal contractor is considering entering the recycled field. At present he incinerates an organic waste containing recoverable solvents and dumps the aqueous based effluent containing acids and metals.
The recovery of each main component in each product is to be 98%. For example, 98% of the propane in the feed stream is to appear in the propane-rich product, and 98% of the combined pentanes in the feed stream is to appear in the bottoms product ..
what drum speed in r/min is necessary to make the amount of filtrate delivered in 24 h from the rotary filter exactly equal to the maximum amount of filtrate obtainable per 24 h from the plate-and-frame filter?
Which do you think would make the best resistor and why?
Calculate the light fluence rate integrated over a sphere of a 5-cm radius centered at the source.
Calculate the average mechanical torque needed to turn the coil and generate power for the resistor. Identify the action of the device as that of a motor or a generator.
The value of the product is $14.08 per pound, and the plant operates 300 days per year. Assuming no costs are involved other than those mentioned, what is the maximum annual profit that can be obtained under these conditions?
Consider the solenoid with a core of square cross section shown in Figure P12.4.6.
Assuming that sucrose is produced by the reaction: 12CO2(g)+11H2O(l) yields C12H22O11(s) 12O2(g); delta H=5640kj calculate the percentage of sunlight used to produce the sucrose- that is, determine the efficiency of photosynthesis.
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