Sail E0 Webinar

MCQs

Dc Motors

Total Questions : 240 | Page 18 of 24 pages
Question 171. If a dc motor is comnected across the AC supply it will
  1.    Burn due to heat produced in the field winding by eddy currents
  2.    Run at normal speed
  3.    Run at lower speed
  4.    Not run
 Discuss Question
Answer: Option A. -> Burn due to heat produced in the field winding by eddy currents
Question 172. These days dc motors are widely used in
  1.    Air compressors
  2.    Machine shops
  3.    Electric traction
  4.    Pumping sets
 Discuss Question
Answer: Option C. -> Electric traction
Question 173. Which of the following law can be used to determine the direction of rotation of dc motor?
  1.    Lenz's law
  2.    Coloumb's law
  3.    Faraday's law
  4.    Fleming's left hand rule
 Discuss Question
Answer: Option D. -> Fleming's left hand rule
Question 174. Small dc motors up to 5 HP usually have
  1.    6 poles
  2.    8 poles
  3.    4 poles
  4.    2 poles
 Discuss Question
Answer: Option D. -> 2 poles
Question 175. A direct on line starter is used for starting motors
  1.    Upto 15 HP
  2.    Upto 10 HP
  3.    Upto 5 HP
  4.    Upto 20 HP
 Discuss Question
Answer: Option C. -> Upto 5 HP
Question 176. If the speed of a dc shunt motor is increased the back emf of the motor will
  1.    Increase
  2.    Remains same
  3.    Decrease
  4.    Become zero
 Discuss Question
Answer: Option A. -> Increase
Question 177. What will happen if the back emf of a dc motor vanishes suddenly?
  1.    The motor will stop
  2.    The motor will run noisy
  3.    The motor will continue to run
  4.    The armature may burn
 Discuss Question
Answer: Option D. -> The armature may burn
Question 178. When two dc series motor are commected in parallel, the resultant speed is
  1.    Zero
  2.    Normal speed
  3.    Loss than the normal speed
  4.    More than the normal speed
 Discuss Question
Answer: Option B. -> Normal speed
Question 179. Ward-Leonard control is basically a
  1.    Voltage control method
  2.    Armature resistance control method
  3.    Field divertor method
  4.    Field control method
 Discuss Question
Answer: Option A. -> Voltage control method
Question 180. The plugging gives the
  1.    Highest torque braking
  2.    Smallest torque braking
  3.    None of the listed here
  4.    Zero torque braking
 Discuss Question
Answer: Option A. -> Highest torque braking

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

GPOE / GPA Combined 1 Free CBT Mock Test SAIL E0 2024
Tabulation - Test Paper 5 Data Interpretation Reasoning & DI
Tabulation - Test Paper 4 Data Interpretation Reasoning & DI
Tabulation - Test Paper 3 Data Interpretation Reasoning & DI
Pie Chart - Test Paper 1 Data Interpretation Reasoning & DI