Related InterviewSolutions

• For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor?(a) Leading(b) Lagging(c) Upf(d) ZpfI had been asked this question in final exam.Query is from Power Flow Through an Inductive Impedance in division Efficiency and Regulation of Electrical Machines
• For a 3 phase synchronous generator of terminal voltage as 1 pu and field excitation of 1.2 pu. If the resistive drop is 0.2 pv, then what can be concluded for power factor?(a) upf(b) zpf(c) lagging pf(d) leading pfThe question was asked at a job interview.Question is taken from Power Flow Through an Inductive Impedance in section Efficiency and Regulation of Electrical Machines
• In a 3-phase cylindrical-rotor alternator, synchronous reactance is sum of _____________(a) mutual and leakage reactance(b) magnetizing and leakage reactance(c) magnetizing and mutual reactance(d) mutual, magnetizing and leakage reactanceI had been asked this question during an internship interview.I would like to ask this question from Efficiency of Synchronous Machines in division Efficiency and Regulation of Electrical Machines
• The given variable losses are 5kW fr a 500 KVA, 11 kV, 3-phase star connected alternator having armature resistance of 4 ohms. Calculate the full load armature current per phase.(a) 26.24 A(b) 20.41 A(c) 79 A(d) 40 AThis question was posed to me in an international level competition.Question is from Efficiency of Synchronous Machines topic in section Efficiency and Regulation 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 excitation(d) armature current onlyThe question was posed to me in an online interview.This intriguing question originated from Efficiency of Synchronous Machines in portion Efficiency and Regulation of Electrical Machines
• The given variable losses are 5kW fr a 500 KVA, 11 kV, 3-phase star connected alternator having armature resistance of 4 ohms. Calculate the current at which maximum efficiency occurs?(a) 20.4A(b) 10.2A(c) 40A(d) 26AThis question was posed to me in an interview for job.I would like to ask this question from Efficiency of Synchronous Machines topic in portion Efficiency and Regulation of Electrical Machines
• An 3 phase alternator star connected 400 V synchronous motor takes a power input of 5472 watts at rated voltage. Its synchronous reactance is 10** per phase and negligible resistance. If its excitation voltage is adjusted equal to the rated voltage of 400 V, its power factor is _______(a) cos(10°)(b) cos(20°)(c) cos(40°)(d) cos(30°)The question was asked in an interview for internship.Question is taken from Power Flow Through an Inductive Impedance topic in chapter Efficiency and Regulation of Electrical Machines
• The short circuit load losses is/are ______________(a) direct load loss and stray load losses(b) direct load loss(c) stray load losses(d) field current lossThe question was asked in semester exam.This is a very interesting question from Efficiency of Synchronous Machines in section Efficiency and Regulation of Electrical Machines
• An alternator, with synchronous reactance of 0.8 pv is connected to an IBB at rated voltage. With its excitation emf adjusted to 1.3 pv, the alternator delivers an output of 0.5 pv. The load angle is __________(a) 17.92(b) 72.08(c) 34.92(d) 90I had been asked this question in a national level competition.The question is from Power Flow Through an Inductive Impedance topic in chapter Efficiency and Regulation of Electrical Machines
• An ________ synchronous machine delivers reactive power whereas an ________ one absorbs reactive power.(a) over excited, under excited(b) under excited, over excited(c) over excited, over excited(d) under excited, normal excitedThe question was posed to me during a job interview.The question is from Power Flow Through an Inductive Impedance in section Efficiency and Regulation of Electrical Machines