Sail E0 Webinar

MCQs

Electromagnetic Induction, Alternating Current And Voltage

Total Questions : 385 | Page 4 of 39 pages
Question 31. Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is
  1.    5 mH
  2.    10 mH
  3.    5 H
  4.    10 H
 Discuss Question
Answer: Option C. -> 5 H
Question 32. A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is
  1.    3500 mH
  2.    350 mH
  3.    250 mH
  4.    150 mH
 Discuss Question
Answer: Option B. -> 350 mH
Question 33. The direction of induced e.m.f. can be found by
  1.    Laplace's law
  2.    Lenz's law
  3.    Fleming's right hand rule
  4.    Kirchhoff s voltage law
 Discuss Question
Answer: Option B. -> Lenz's law
Question 34. In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will
  1.    Increase
  2.    Decrease
  3.    Remain the same
  4.    Initially increase and then decrease
 Discuss Question
Answer: Option B. -> Decrease
Question 35. Higher the self-inductance of a coil,
  1.    Lesser its weber-turns
  2.    Lower the e.m.f. induced
  3.    Greater the flux produced by it
  4.    Longer the delay in establishing steady current through it
 Discuss Question
Answer: Option D. -> Longer the delay in establishing steady current through it
Question 36. The inductance of a coil will increase under all the following conditions except
  1.    When more length for the same number of turns is provided
  2.    When the number of turns of the coil increase
  3.    When more area for each turn is provided
  4.    When permeability of the core increases
 Discuss Question
Answer: Option A. -> When more length for the same number of turns is provided
Question 37. The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns.
  1.    Yes
  2.    No
 Discuss Question
Answer: Option B. -> No
Question 38. As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it
  1.    Lies perpendicular to the magnetic flux
  2.    Lies in a magnetic field
  3.    Cuts magnetic flux
  4.    Moves parallel to the direction of the magnetic field
 Discuss Question
Answer: Option C. -> Cuts magnetic flux
Question 39. Air-core coils are practically free from
  1.    Hysteresis losses
  2.    Eddy current losses
  3.    Both A and B
  4.    None of the above
 Discuss Question
Answer: Option C. -> Both A and B
Question 40. The coefficient of coupling between two air core coils depends on
  1.    Self-inductance of two coils only
  2.    Mutual inductance between two coils only
  3.    Mutual inductance and self inductance of two coils
  4.    None of the above
 Discuss Question
Answer: Option C. -> Mutual inductance and self inductance of two coils

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