Sail E0 Webinar

MCQs

Dc Motors

Total Questions : 240 | Page 6 of 24 pages
Question 51. In a differentially compounded D.C. motor, if shunt field suddenly opens
  1.    The motor will first stop and then run in opposite direction as series motor
  2.    The motor will work as series motor and run at slow speed in the same direction
  3.    The motor will work as series motor and run at high speed in the same direction
  4.    The motor will not work and come to stop
 Discuss Question
Answer: Option A. -> The motor will first stop and then run in opposite direction as series motor
Question 52. For which types of D.C. motor, dynamic braking is generally used?
  1.    Shunt motors
  2.    Series motors
  3.    Compound motors
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 53. Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads?
  1.    Series motor
  2.    Shunt motor
  3.    Cumulatively compounded motor
  4.    Differentially compounded motor
 Discuss Question
Answer: Option C. -> Cumulatively compounded motor
Question 54. The type of D.C. motor used for shears and punches is
  1.    Shunt motor
  2.    Series motor
  3.    Differential computed D.C. motor
  4.    Cumulative compound D.C. motor
 Discuss Question
Answer: Option D. -> Cumulative compound D.C. motor
Question 55. Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of
  1.    D.C. series motor
  2.    D.C. shunt motor
  3.    Induction motor
  4.    All of above motors
 Discuss Question
Answer: Option A. -> D.C. series motor
Question 56. The purpose of retardation test on D.C. shunt machines is to find out
  1.    Stray losses
  2.    Eddy current losses
  3.    Field copper losses
  4.    Windage losses
 Discuss Question
Answer: Option A. -> Stray losses
Question 57. In a D.C. shunt motor, speed is
  1.    Independent of armature current
  2.    Directly proportional to the armature current
  3.    Proportional to the square of the current
  4.    Inversely proportional to the armature current
 Discuss Question
Answer: Option A. -> Independent of armature current
Question 58. To get the speed of D.C, motor below the normal without wastage of electrical energy is used.
  1.    Ward Leonard control
  2.    Rheostat control
  3.    Any of the above method
  4.    None of the above method
 Discuss Question
Answer: Option A. -> Ward Leonard control
Question 59. Which of the following application requires high starting torque?
  1.    Lathe machine
  2.    Centrifugal pump
  3.    Locomotive
  4.    Air blower
 Discuss Question
Answer: Option C. -> Locomotive
Question 60. If the field of a D.C. shunt motor gets opened while motor is running
  1.    The speed of motor will be reduced %
  2.    The armature current will reduce
  3.    The motor will attain dangerously high speed 1
  4.    The motor will continue to run at constant speed
 Discuss Question
Answer: Option C. -> The motor will attain dangerously high speed 1

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