At a location in europe it is necesary to supply 300kw of 60hz power. The any Power sources avaiable aperate at 50hz It is decided to generate the pawer by means of a mator-generator set consisting of a smchronous mator driving a Snchranous generator. How many poes should each of the twa machines have in arder ta Convert 50hz POwer to 60hz pPower?

At a location in europe it is necesary to supply 300kw of 60hz power. The any Power sources avaiable aperate at 50hz It is decided to generate the pawer by means of a mator-generator set consisting of a smchronous mator driving a Snchranous generator. How many poes should each of the twa machines have in arder ta Convert 50hz POwer to 60hz pPower?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter29: Dc Generators

Section: Chapter Questions

Problem 1PA: You are working as an electrician in a large steel manufacturing plant, and you are in the process...

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You are working as an electrician in a large steel manufacturing plant, and you are in the process of doing preventive maintenance on a large DC generator. You have megged both the series and shunt field windings and found that each has over 10 M to ground. Your ohmmeter, however, indicates a resistance of 1.5 across terminals S1andS2. The ohmmeter indicates a resistance of 225 between terminals F1andF2. Are these readings normal for this type machine, or is there a likely problem? Explain your answer.
A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and L=40mH. (a) Determine the power factor of the circuit and state whether it is lagging or leading. (b) Determine the real and reactive power absorbed by the load. (c) Calculate the peak magnetic energy Wint stored in the inductor by using the expression Wint=L(Irms)2 and check whether the reactive power Q=Wint is satisfied. (Note: The instantaneous magnetic energy storage fluctuates between zero and the peak energy. This energy must be sent twice each cycle to the load from the source by means of reactive power flows.)
An ac resistance is higher than a dc resistance. True False
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Q4. The source current in the circuit shown is in Figure 3a) What impedance should be connected across terminals a,b for maximum average powertransfer?b) What is the average power transferred to the impedance in (a)?c) Assume that the load is restricted to pure resistance. What size resistor connected across a,bwill result in the maximum average power transferred?d) What is the average power transferred to the resistor in (c)?v