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• A synchronous machine is operating at constant load and at unity power factor. If its excitation is increased, then it operates as ___________(a) generator at lagging p.f(b) motor at lagging p.f(c) absorber of reactive power(d) generator at leading p.fThis question was posed to me in homework.I want to ask this question from Starting of Synchronous Motors topic in section Synchronous Motors of Electrical Machines
• Power factor of a synchronous motor varies when the ___________(a) applied voltage is varied(b) load is changed(c) supply frequency and field excitation is changed(d) all of the mentionedThis question was addressed to me by my college professor while I was bunking the class.Enquiry is from Starting of Synchronous Motors in section Synchronous Motors of Electrical Machines
• A synchronous machine is operating at constant load and at unity power factor. If its excitation is increased and then it operates as ___________(a) motor at leading p.f(b) motor at lagging p.f(c) absorber of reactive power(d) generator at leading p.fThis question was posed to me in exam.My question comes from Starting of Synchronous Motors in chapter Synchronous Motors of Electrical Machines
• The reactive power output of a synchronous generator is limited by ___________(a) armature current and field current(b) field current and load angle(c) load angle and prime mover input(d) armature current and prime mover inputThe question was posed to me during an interview.My doubt is from Starting of Synchronous Motors topic in chapter Synchronous Motors of Electrical Machines
• A 3-phase, 400V, synchronous motor is providing load at 0.8 p.f. lagging. If the field current of the motor is continuously increased, then the _____________(a) power factor increases and then decreases(b) power factor is not affected(c) power factor decreases upto a certain value of field current and then increases(d) power facor increases simplyI got this question in an interview for job.This intriguing question originated from Starting of Synchronous Motors in section Synchronous Motors of Electrical Machines
• In a 3-phase cylindrical-rotor alternator, synchronous reactance is sum of mutual and leakage reactance.(a) True(b) FalseThe question was posed to me during an online interview.This intriguing question originated from Starting of Synchronous Motors topic in division Synchronous Motors of Electrical Machines
• A synchronous machine with its field winding on stator and polyphase armature winding on rotor. At steady state, which of the following is not true for its air gap field?(a) stationary w.r.t. stator(b) rotating at double the speed Ns w.r.t. rotor(c) rotating in direction opposite to rotor(d) rotating at Ns w.r.t. rotorThis question was posed to me during a job interview.This question is from Starting of Synchronous Motors topic in portion Synchronous Motors of Electrical Machines
• These days alternators are designed to have larger air gaps for __________(a) stable parallel operation(b) higher stability limit(c) sinusoidal mmf distribution(d) all of the mentionedThe question was posed to me during an interview for a job.The question is from Starting of Synchronous Motors in section Synchronous Motors of Electrical Machines
• Rating of the dc motor to be used in the starting of SM, should be higher than the synchronous motor.(a) True(b) FalseI got this question in quiz.My question is from Starting of Synchronous Motors topic in division Synchronous Motors of Electrical Machines
• Auxiliary method of starting is not possib1e due to the fact that ____________(a) it can not be started under load(b) it can be only started under load(c) it is less efficient(d) all of the mentionedI have been asked this question during an online exam.I would like to ask this question from Starting of Synchronous Motors topic in section Synchronous Motors of Electrical Machines