Sail E0 Webinar

MCQs

Total Questions : 473 | Page 2 of 48 pages
Question 11. The low power factor of induction motor is due to
  1.    Rotor leakage reactance
  2.    Stator reactance
  3.    The reactive lagging magnetizing current necessary to generate the magnetic flux
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 12. If any two phases for an induction motor are interchanged
  1.    The motor will run in reverse direction
  2.    The motor will run at reduced speed
  3.    The motor will not run
  4.    The motor will burn
 Discuss Question
Answer: Option A. -> The motor will run in reverse direction
Question 13. Slip of an induction motor is negative when
  1.    Magnetic field and rotor rotate in opposite direction
  2.    Rotor speed is less than the synchronous speed of the field and are in the same direction
  3.    Rotor speed is more than the synchronous speed of the field and are in the same direction
  4.    None of the above
 Discuss Question
Answer: Option C. -> Rotor speed is more than the synchronous speed of the field and are in the same direction
Question 14. The injected e.m.f. in the rotor of induction motor must have
  1.    Zero frequency
  2.    The same frequency as the slip frequency
  3.    The same phase as the rotor e.m.f.
  4.    High value for the satisfactory speed control
 Discuss Question
Answer: Option B. -> The same frequency as the slip frequency
Question 15. The torque developed by a 3-phase induction motor least depends on
  1.    Rotor current
  2.    Rotor power factor
  3.    Rotor e.m.f.
  4.    Shaft diameter
 Discuss Question
Answer: Option D. -> Shaft diameter
Question 16. The good power factor of an induction motor can be achieved if the average flux density in the air gap is
  1.    Absent
  2.    Small
  3.    Large
  4.    Infinity
 Discuss Question
Answer: Option B. -> Small
Question 17. In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be
  1.    Ns
  2.    s.N
  3.    (l-s) Ns
  4.    (Ns-l) s
 Discuss Question
Answer: Option C. -> (l-s) Ns
Question 18. The rotor of an induction motor runs at
  1.    Synchronous speed
  2.    Below synchronous speed
  3.    Above synchronous speed
  4.    Any of the above
 Discuss Question
Answer: Option B. -> Below synchronous speed
Question 19. Which of the following component is usually fabricated out of silicon steel?
  1.    Bearings
  2.    Shaft
  3.    Stator core
  4.    None of the above
 Discuss Question
Answer: Option C. -> Stator core
Question 20. Insertion of resistance in the rotor of an induction motor to develop a given torque
  1.    Decreases the rotor current
  2.    Increases the rotor current
  3.    Rotor current becomes zero
  4.    Rotor current remains same
 Discuss Question
Answer: Option D. -> Rotor current remains same

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