Related InterviewSolutions

• Consider a dc machine having its armature wound in lap fashion having 12 coils and each resistance 0.1 ohms. If it is measured resistance between two adjacent commutator segments, the result will be _________(a) 0.092 ohms(b) 1.1 ohms(c) 1.8 ohms(d) 0.92 ohmsThis question was addressed to me during an online interview.My query is from Armature Windings in section Armature Windings of Electrical Machines
• A 6-pole lap wound DC generator has a developed power of P watts and brush voltage of E volts. Three adjacent brushes of the machine had been found worn out and got open circuited. If the machine is operated with the remaining brushes, voltage and power that could be obtained from the machine are _________(a) E, P(b) E, 2P/3(c) E/P, 2P/3(d) E, P/3I had been asked this question in an international level competition.Enquiry is from Armature Windings topic in portion Armature Windings of Electrical Machines
• While doing regular checks on the dc machine with the lap connected winding, it is reported to have ammeter fluctuations, this can be due to _________(a) different air gaps under poles(b) variable reluctances in the core(c) irregular design deformations(d) all of the mentionedI have been asked this question in an online quiz.The question is from Armature Windings in portion Armature Windings of Electrical Machines
• For a given dc machine it is advised to use the dummy windings for a stable operation. But if it has be replaced as it unused component in the machine, then we must _________(a) S/P/2 should not be an integer(b) S/P/2 should be integer(c) S/P should be integer(d) S/P should not be an integerThe question was posed to me during an interview for a job.Origin of the question is Armature Windings in chapter Armature Windings of Electrical Machines
• For an electrical machine with C number of coils and P poles, the distance between the coils connected by an equalizer ring is?(a) C/P(b) C/2(c) 2C/P(d) C/2PThis question was addressed to me in quiz.My question comes from Armature Windings topic in division Armature Windings of Electrical Machines
• With a P-pole DC machine with armature current Ia, the current per brush arm for a lap connected windings is?(a) Ia/P(b) Ia/2P(c) 2Ia/P(d) Ia/4PI have been asked this question during an interview.My enquiry is from Armature Windings in chapter Armature Windings of Electrical Machines
• In AC machines we should prefer double layer winding over single layer windings because _________(a) it requires identical coils(b) it is economical to use(c) it offers lower leakage reactance(d) all of the mentionedI had been asked this question in an international level competition.The question is from Armature Windings in portion Armature Windings of Electrical Machines
• We can employ dummy coils in a DC machine to _________(a) compensate reactance voltage(b) reduce armature reaction(c) provide mechanical balance to the armature(d) improve the waveforms generated inside the commutatorI have been asked this question in a national level competition.My doubt stems from Armature Windings in portion Armature Windings of Electrical Machines
• Commutator segments in a DC shunt machine is equal to the number of _________(a) coil sides(b) turns(c) coils(d) slotsThis question was posed to me during an interview.I need to ask this question from Armature Windings topic in chapter Armature Windings of Electrical Machines
• A 200V dc machine has 4 poles and 40 coils, having simplex lap winding. The number of commutator segments which required in the given machine will be?(a) 40(b) 20(c) 80(d) 26This question was addressed to me in semester exam.This intriguing question comes from Armature Windings topic in section Armature Windings of Electrical Machines