This set of DC Machines Multiple Choice Questions & Answers (MCQs) focuses on “Lap Winding”. 1. Resultant pitch in the lap winding is__________ a) Depends on Yb value b) Depends on Yf value c) Depends on Yb and Yf value d) Always equal to 2 2. What is the condition of retrogressive winding? a) Yb … Read more
This set of DC Machines Multiple Choice Questions & Answers (MCQs) focuses on “Armature Winding and Commutator”. 1. Armature winding is mounted on a __________ a) Stator b) Rotor c) Can be mounted anywhere on stator or rotor d) Not required 2. In a DC machine, how coil-side emf varies towards the outer side of … Read more
This set of DC Machines Multiple Choice Questions & Answers (MCQs) focuses on “PMDC Motors”. 1. In PMDC motors we use magnetic material with ___________ a) Low residual flux b) Low coercivity c) High residual flux d) All magnetic materials 2. In PMDC magnetic material is placed instead of _____________ a) Armature b) Rotor c) … Read more
This set of DC Machines Interview Questions and Answers focuses on “Brushes and Commutator Assembly – 2”. 1. In a DC generator the ripples in the direct emf generated can be reduced by________ a) Using conductor of annealed copper b) Using commutator with large number of segments c) Using carbon brushes of superior quality d) … Read more
This set of DC Machines Multiple Choice Questions & Answers (MCQs) focuses on “Brushes and Commutator Assembly – 1”. 1.The armature in DC machines is always placed on rotor because _______ a) Otherwise commutation will not be possible b) Otherwise there will not be any induced emf c) Otherwise current will not flow d) Can … Read more
This set of DC Machines Multiple Choice Questions & Answers (MCQs) focuses on “Applications of DC Machines”. 1. Why are the DC motors preferred for traction applications? a) Torque and speed are inversely proportional to armature current b) Torque is proportional to armature current c) Torque is proportional to square root of armature current d) … Read more
This set of DC Machines Multiple Choice Questions & Answers (MCQs) focuses on “Construction”. 1. Where is field winding mounted in a DC machine? a) Stator b) Rotor c) Absent d) Anywhere on stator or rotor 2. What are the materials used for brushes in dc machines? a) Iron b) Carbon c) Aluminum d) Steel … Read more
