Sail E0 Webinar

MCQs

Dc Motors

Total Questions : 240 | Page 3 of 24 pages
Question 21. In case of conductively compensated D.C. series motors, the compensating winding is provided
  1.    As separately wound unit
  2.    In parallel with armature winding
  3.    In series with armature winding
  4.    In parallel with field winding
 Discuss Question
Answer: Option C. -> In series with armature winding
Question 22. If a D.C. motor is to be selected for conveyors, which rioter would be preferred?
  1.    Series motor
  2.    Shunt motor
  3.    Differentially compound motor
  4.    Cumulative compound motor
 Discuss Question
Answer: Option A. -> Series motor
Question 23. The starting resistance of a D.C. motor is generally
  1.    Low
  2.    Around 500 Q
  3.    1000 Q
  4.    Infinitely large
 Discuss Question
Answer: Option A. -> Low
Question 24. Torque developed by a D.C. motor depends upon
  1.    Magnetic field
  2.    Active length of the conductor
  3.    Current flow through the conductors
  4.    All above factors
 Discuss Question
Answer: Option D. -> All above factors
Question 25. D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the
  1.    Series motor
  2.    Shunt motor
  3.    Compound motor
  4.    Any of the above
 Discuss Question
Answer: Option A. -> Series motor
Question 26. As the load is increased the speed of D.C. shunt motor will
  1.    Reduce slightly
  2.    Increase slightly
  3.    Increase proportionately
  4.    Remains unchanged
 Discuss Question
Answer: Option A. -> Reduce slightly
Question 27. The total losses in a well designed D.C. generator of 10 kW will be nearly
  1.    100 W
  2.    500 W
  3.    1000 W
  4.    1500 W
 Discuss Question
Answer: Option B. -> 500 W
Question 28. Why are the D.C. motors preferred for traction applications?
  1.    Torque and speed are inversely proportional to armature current
  2.    Torque is proportional to armature current
  3.    Torque is proportional to square root of armature current
  4.    The speed is inversely proportional to the torque and the torque is proportional to square of armature current
 Discuss Question
Answer: Option D. -> The speed is inversely proportional to the torque and the torque is proportional to square of armature current
Question 29. D.C. generators are installed near the load centers to reduce
  1.    Iron losses
  2.    Line losses
  3.    Sparking
  4.    Corona losses
 Discuss Question
Answer: Option B. -> Line losses
Question 30. Sparking, is discouraged in a D.C. motor because
  1.    It increases the input power consumption
  2.    Commutator gets damaged
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option B. -> Commutator gets damaged

Latest Videos
Chapter 1 - GLOBAL STEEL SCENARIO & INDIAN STEEL INDUSTRY Part 1 : (13-04-2024) INDUSTRY AND COMPANY AWARENESS (ICA)
Direction Sense Test Part 1 Reasoning (Hindi)
Chapter 1 - RMHP / OHP / OB & BP Part 1 : (14-02-2024) GPOE
Cube & Cuboid Part 1 Reasoning (Hindi)
Data Interpretation (DI) Basic Concept Reasoning (Hindi)
Counting Figures Part 1 Counting Of Straight Lines Reasoning (Hindi)
Sail E0 free webinar Webinars
Real Numbers Part 7 Class 10 Maths
Real Numbers Part 1 Class 10 Maths
Polynomials Part 1 Class 10 Maths

Latest Test Papers

Pie Chart - Test Paper 1 Data Interpretation Reasoning & DI
Tabulation - Test Paper 2 Data Interpretation Reasoning & DI
Test Paper 1 Direction Sense Test Reasoning & DI
ICA , RDIC,GFM Free Modal Test Paper - Non - Technical Branch Old Syllabus 2022 - SAIL Junior Officer E0
GFM Combined 1 Free Revision Test SAIL JO E-0