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• A d.c. generator has been provided tappings on the armature winding at intervals of 120 degrees from the side of commutator. The connection will be __________(a) delta connected alternator(b) star connected alternator(c) star connected induction motor(d) any of the mentionedThe question was posed to me in quiz.My question is based upon DC Machine Applications in portion DC Machines of Electrical Machines
• A 200 V dc motor has external resistances of Ra and Rf in armature and field circuits respectively. The starting current is reduced when?(a) Ra is maximum and Rf minimum(b) Rf is maximum and Ra minimum(c) Ra is minimum and Rf minimum(d) Ra is maximum and Rf maximumThe question was posed to me in homework.The query is from DC Machine Applications in portion DC Machines of Electrical Machines
• Interpoles are used to start the dc motor above the base speed.(a) True(b) FalseI have been asked this question in examination.Asked question is from DC Machine Applications in section DC Machines of Electrical Machines
• If a dc shunt motor is stopped by forcing starter handle back to OFF position, then the __________(a) dangerous sparking occurs at last stud(b) dangerous sparking occurs at all stud(c) it stops normally(d) heavy sparkingThe question was posed to me by my college director while I was bunking the class.Question is taken from DC Machine Applications in division DC Machines of Electrical Machines
• Long back ago, magnetic casette were in use, having permanent magnet dc motors which had?(a) magnets on stator and armature on rotor(b) magnet on rotor and armature on stator(c) electronic commutation(d) all of the mentionedI had been asked this question in a national level competition.This interesting question is from DC Machine Applications in section DC Machines of Electrical Machines
• Most commercial compound dc generator are normally supplied by manufacturers as ______ compounded machines.(a) over(b) under(c) level(d) none of the mentionedI have been asked this question by my college director while I was bunking the class.My question is based upon DC Machine Applications in chapter DC Machines of Electrical Machines
• Which of the following are applied with differential compound motor?(a) Hoist(b) Cranes(c) Drilling machines(d) None of the mentionedThis question was addressed to me in a national level competition.This interesting question is from DC Machine Applications topic in chapter DC Machines of Electrical Machines
• Most commercial compound dc generator are normally supplied by manufacturers as over compound machines because __________(a) degree of compounding can be adjusted by diverters acrosss series field(b) they have ideally best for HVDC(c) cost effective than shunt(d) zero percent regulationThe question was asked by my college professor while I was bunking the class.The question is from DC Machine Applications topic in section DC Machines of Electrical Machines
• Centrifugal pumps, fans-blowers use __________(a) shunt as well as induction motor(b) only shunt motors(c) only induction motor(d) none of the mentionedI had been asked this question by my college professor while I was bunking the class.My question is taken from DC Machine Applications in chapter DC Machines of Electrical Machines
• Hoists, cranes and battery powered vehicles use _________ motors in the locomotive.(a) dc series(b) dc shunt(c) induction(d) reluctanceI had been asked this question in an international level competition.Question is from DC Machine Applications topic in chapter DC Machines of Electrical Machines