Sail E0 Webinar

MCQs

Total Questions : 377 | Page 4 of 38 pages
Question 31. Laminations of core are generally made of
  1.    Case iron
  2.    Carbon
  3.    Silicon steel
  4.    Stainless steel
 Discuss Question
Answer: Option C. -> Silicon steel
Question 32. In D.C. generators on no-load, the air gap flux distribution in space is
  1.    Sinusoidal
  2.    Triangular
  3.    Pulsating
  4.    Flat topped
 Discuss Question
Answer: Option D. -> Flat topped
Question 33. A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave
  1.    will be zero
  2.    will be of 5 Hz
  3.    will be of 5 xiVHz
  4.    will be of v Hz 5
 Discuss Question
Answer: Option B. -> will be of 5 Hz
Question 34. Which of the following could be lamina proximately the thickness of laminations of a D.C. machine?
  1.    0.005 mm
  2.    0.05 mm
  3.    0.5 m
  4.    5 m
 Discuss Question
Answer: Option C. -> 0.5 m
Question 35. The essential condition for parallel operation of two D.C. generators is that they have
  1.    Same kW rating
  2.    The same operation r.p.m.
  3.    The same drooping voltage characteristics
  4.    Same percentage regulation
 Discuss Question
Answer: Option C. -> The same drooping voltage characteristics
Question 36. The rapid wear of brushes takes place due to
  1.    Abrasion from dust
  2.    Excessive spring pressure
  3.    Rough commutator bars
  4.    All of the above factors
 Discuss Question
Answer: Option D. -> All of the above factors
Question 37. In case of D.C. machine winding, number of commutator segments is equal to
  1.    Number of armature coils
  2.    Number of armature coil sides
  3.    Number of armature conductors
  4.    Number of armature turns
 Discuss Question
Answer: Option A. -> Number of armature coils
Question 38. The bearings used to support the rotor shafts are generally
  1.    Ball bearings
  2.    Bush bearings
  3.    Magnetic bearings
  4.    Needle bearings
 Discuss Question
Answer: Option A. -> Ball bearings
Question 39. The insulating material used between the commutator segments is normally
  1.    Graphite
  2.    Paper
  3.    Mica
  4.    Insulating varnish
 Discuss Question
Answer: Option C. -> Mica
Question 40. If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to
  1.    reverse the field connections
  2.    increase the field resistance
  3.    increase the speed of primemover
  4.    check armature insulation resistance
 Discuss Question
Answer: Option A. -> reverse the field connections

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