This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Ideal Two Winding Transformer”. 1. Which of the following statements support the ideal transformer features? I. Zero winding resistance II. Zero leakage flux III. Constant core losses a) I, II b) III c) I, III d) I, II, III 2. Which of … Read more
This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Transformer Construction”. 1. The primary and secondary of a transformer are ________ coupled but _______ connected. a) magnetically, not electrically b) electrically, not magnetically c) magnetically, also magnetically d) electrically, also electrically 2. We can employ transformers for a power range of … Read more
This set of Basic Electrical Machines Questions and Answers focuses on “Armature Windings”. 1. Concentrated winding differ from distributed winding with the concern of _________ a) identical magnetic axis b) two magnetic axis c) no magnetic axis d) physical spacing 2. DC machines have ________ windings and synchronous machines use ______ windings. a) closed,open b) … Read more
This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Applications of Polyphase Induction Motors”. 1. Wound rotor induction motor is most appropriate for the applications requiring ______________ a) high starting torque b) variable starting torque c) fixed starting torque d) all of the mentioned 2. Relatively a squirrel-cage induction motor is … Read more
This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Induction Generator”. 1. A 3-phase induction motor can also be run as ______________ a) synchronous generator b) induction generator c) dc shunt motor d) any of the mentioned 2. Induction generator ____________ a) can not work in isolation b) can work in … Read more
This set of Electrical Machines test focuses on “Starting of Polyphase Induction Motors-II”. 1. A 3-phase induction motor is fed at the stator at a frequency f. If the rotor speed is Nr and synchronous speed is Ns, then the absolute speed of the resultant flux in space is? a) Ns b) (Ns+Nr) if the … Read more
This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Starting of Polyphase Induction Motors”. 1. Voltage induce in the induction motor is highest at __________ a) starting b) standstill c) rated speed d) any of the mentioned 2. Starters are required in the induction motor because __________ a) of high starting … Read more
This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Power Factor Control of Three Phase Induction Motors”. 1. The 3-phase induction motor operates at lagging power factor due to ________ I. Leading magnetizing current necessary to produce the working flux. II. Voltage drops in the leakage impedance. III. Lagging magnetizing current … Read more
This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Circle Diagrams of Induction Machines”. 1. Circle diagram of an induction motor is graphical representation of ____________ a) its equivalent circuit b) its rotor equivalent c) its stator equivalent d) its stationary equivalent circuit 2. Circle diagram depicts the relation between ____________ … Read more
This set of Electrical Machines Questions and Answers for Aptitude test focuses on “Determination of Equivalent Circuit Parameters”. 1. Blocked rotor test comprises of ____________ a) rotor and stator copper losses. b) rotor copper and stator core losses. c) rotor core losses d) stator copper losses 2. A 10kW,400V, 4-pole delta connected induction motor gave … Read more
