Category Archives: Electrical Machines MCQ

This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Operating Characteristics of DC Generators”. 1. Which of the following characteristics reveal about the magnetization nature of the machine? a) No-load characteristics b) Load characteristics c) Armature characteristics d) Both no-load and load characteristics 2. Choose the most inappropriate out of the … Read more

This set of Electrical Machines MCQs focuses on “Effect of Brush Shift and Compensation Windings”. 1. The brushes are placed __________ a) along geometrical neutral axis b) perpendicular to geometrical neutral axis c) along magnetic neutral axis d) perpendicular to magnetic neutral axis 2. The brushes should be shifted in _______ direction in generator for … Read more

This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Mmf and Flux Density wave forms in dc machines”. 1. The armature mmf affects __________ a) commutation b) generated voltage c) torque d) any of the mentioned 2. The space distribution of flux produced in a DC machine is? a) b) c) … Read more

This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Methods of Excitation in DC Machines”. 1. Consider a DC generator running at the rated speed of 2000 rpm, suddenly there is an insulator falls on the field circuit and breaks it. Then __________ a) the motor stops in a few rounds … Read more

This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Circuit Model of DC Machines”. 1. The circuit depicting the equation V=Ea + I*Ra. a) b) c) d) 2. The circuit depicting the equation V=Ea – I*Ra. a) b) c) d) None of the mentioned 3. If the terminal voltage of 220-V … Read more

This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Torque in DC Machines”. 1. Choose the correct representation, which depict a non-zero torque in the armature? a) b) c) d) any of the mentioned 2. What is the principle of torque production in a dc machine? a) Lorentz’s law b) Lenz’s … Read more

This set of Electrical Machines Interview Questions and Answers focuses on “EMF Generated in the Armature”. 1. If the speed of rotation of a separately excited dc machine is halved and the filed strength is also reduced to half of the original. Then the emf induced in the armature _____________ a) reduces to 1/4th of … Read more

This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Action of commutator”. 1. What is Commutator? a) rotating segment to which brushes are attached b) stationary segment to which rotating brushes are attached c) rotating segment to which rotating brush segment is attached d) any of the mentioned 2. Commutator action … Read more

This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Machine applications”. 1. Synchronous-induction coupled motors are required for ____________ a) high starting torque applications b) high pull out torque applications c) high running torques applications d) none of the mentioned 2. Which of the following can be used for braking purposes … Read more

This set of Electrical Machines online test focuses on “Cooling (Loss Dissipation)”. 1. For the given traction application using a dc series motor for a starting time ’t’ is applied. If this method is replaced by a series-parallel control, giving 50% time for each series and parallel. The saving in the starting energy of ____________ … Read more