This set of Electric Drives Multiple Choice Questions & Answers (MCQs) focuses on “Induction Motors – Basics Principles of Speed Control”. 1. In the chopper circuit, commutation times are _______ a) Current commutation is equal to voltage commutation b) Current commutation is less as compared to that of voltage commutation c) Current commutation is more … Read more
This set of Electric Drives Multiple Choice Questions & Answers (MCQs) focuses on “Speed Control of Series Motor”. 1. A particular current is made up of two components: a 10 A and a sine wave of peak value 14.14 A. The average value of current is _________ a) Zero b) 24.14 A c) 10 A … Read more
This set of Electric Drives Question Paper focuses on “Speed Control of Shunt or Separately Excited Motors”. 1. The advantage of the double squirrel cage induction motor over a single cage rotor is that its _______ a) Efficiency is higher b) Power factor is higher c) Slip is larger d) Starting current is lower 2. … Read more
This set of Electric Drives Questions & Answers for Exams focuses on “Methods to Reduce the Energy Loss During Starting”. 1. Calculate the angular frequency of the waveform y(t)=69sin(40πt+4π). a) 40π Hz b) 60π Hz c) 70π Hz d) 20π Hz 2. The generated e.m.f from 22-pole armature having 75 turns driven at 78 rpm … Read more
This set of Electric Drives Multiple Choice Questions & Answers (MCQs) focuses on “Energy Relations During Starting”. 1. 440 V, 77 A, 700 rpm DC separately excited motor having a resistance of 0.11 ohms excited by an external dc voltage source of 24 V. Calculate the torque developed by the motor on full load. a) … Read more
This set of Electric Drives Multiple Choice Questions & Answers (MCQs) focuses on “Starting – Acceleration Time”. 1. Calculate the value of the angular acceleration of the motor using the given data: J = .01 kg-m2, load torque= 790 N-m, motor torque= 169 N-m. a) -62100 rad/s2 b) -62456 rad/s2 c) -34056 rad/s2 d) -44780 … Read more
This set of Electric Drives Multiple Choice Questions & Answers (MCQs) focuses on “Methods of Starting Electric Motors”. 1. Calculate the active power in a .45 H inductor. a) 0.11 W b) 0.14 W c) 0.15 W d) 0 W 2. A 10-pole, 3-phase, 60 Hz induction motor is operating at a speed of 100 … Read more
This set of Electric Drives Objective Questions & Answers focuses on “Effect of Starting on Power Supply, Motor and Load “. 1. The ferrite cores are used for ____________ transformers. a) Small transformers b) Medium transformers c) Large transformers d) Medium and small transformers 2. A 2-pole, 3-phase, 50 Hz induction motor is operating at … Read more
This set of Electric Drives Multiple Choice Questions & Answers (MCQs) focuses on “DC Motors – Three Phase Synchronous Motors”. 1. The direct axis is taken along ________ a) Inter-polar axis b) Rotor pole axis c) In between inter polar and rotor axis d) Parallel to interpolar axis 2. A 4-pole, 3-phase, 60 Hz induction … Read more
This set of Electric Drives Multiple Choice Questions & Answers (MCQs) focuses on “DC Motors – Three Phase Induction Motors”. 1. A three-phase slip ring induction motor is fed from the rotor side with the stator winding short-circuited. The frequency of the current flowing in the short-circuited stator is ____________ a) Slip frequency b) Supply … Read more
