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• The core losses in synchronous machine is _______ dependent.(a) voltage(b) current(c) temperature(d) insulationThe question was posed to me during an online interview.The question is from Operating Characteristics of Alternators and their Ratings in section Synchronous Generators of Electrical Machines
• At zpf lag, the excitation should be increased in order to maintain the armature terminal voltage constant.(a) True(b) FalseI had been asked this question during an interview.Question is from Operating Characteristics of Alternators and their Ratings in portion Synchronous Generators of Electrical Machines
• The rating of the alternator is decided by _________(a) losses(b) voltage(c) armature current(d) temperatureI got this question in exam.Asked question is from Operating Characteristics of Alternators and their Ratings in chapter Synchronous Generators of Electrical Machines
• If the machine was operating at upf, then the new excitation voltage will be _________(a) greater than 1 pu(b) less than 1 pu(c) 1 pu(d) zeroThe question was posed to me in an online interview.This intriguing question comes from Operating Characteristics of Alternators and their Ratings in section Synchronous Generators of Electrical Machines
• Alternator compounding characteristic is obtained by _________(a) keeping Vt constant(b) keeping Ef constant(c) keeping Ia constant(d) varying VtThe question was posed to me during an interview.This question is from Operating Characteristics of Alternators and their Ratings in chapter Synchronous Generators of Electrical Machines
• Ideally the voltage regulation of an alternator should be ___________(a) zero(b) infinite(c) 50%(d) 100%I had been asked this question by my school teacher while I was bunking the class.Origin of the question is Voltage Regulation of an Alternator topic in section Synchronous Generators of Electrical Machines
• If the machine size increases, the three phase alternator resistance _______ and synchronous reactance _______(a) increases, decreases(b) decreases, increases(c) remains constant, decreases(d) decreases, decreasesThe question was posed to me in an online interview.This question is from Voltage Regulation of an Alternator in portion Synchronous Generators of Electrical Machines
• If the emf from the air gap line is the 3-phase alternator is 440V per phase and armature current is 110 A. The synchronous reactance is?(a) 4 ohms(b) 2 ohms(c) 6.92 ohms(d) 2.32 ohmsThis question was posed to me at a job interview.Query is from Voltage Regulation of an Alternator in section Synchronous Generators of Electrical Machines
• In a calculation, the actual voltage regulation is 33.1% while the calculated value of the voltage regulation is 32.9%. This infers that the chosen method has been ___________(a) zpf or asa(b) emf(c) mmf(d) mmf or zpfThe question was posed to me during an interview.I'm obligated to ask this question of Voltage Regulation of an Alternator topic in section Synchronous Generators of Electrical Machines
• In a calculation, the actual voltage regulation is 33.1% while the calculated value of the voltage regulation is 25%. This infers that the chosen method has been ___________(a) emf(b) mmf(c) asa(d) zpfThis question was posed to me in an online interview.This is a very interesting question from Voltage Regulation of an Alternator in division Synchronous Generators of Electrical Machines