Sail E0 Webinar

MCQs

Total Questions : 395 | Page 5 of 40 pages
Question 41. The power developed by a synchronous motor will be maximum when the load angle is
  1.    zero
  2.    45°
  3.    90°
  4.    120°
 Discuss Question
Answer: Option C. -> 90°
Question 42. In a synchronous motor, V-curves represent relation between
  1.    armature current and field current
  2.    power factor and speed
  3.    field current and speed
  4.    field current and power factor
 Discuss Question
Answer: Option A. -> armature current and field current
Question 43. The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as
  1.    locked-rotor torque
  2.    synchronous torque
  3.    pull up torque
  4.    reluctance torque
 Discuss Question
Answer: Option A. -> locked-rotor torque
Question 44. In a synchronous motor, the armature current has large values for
  1.    high excitation only
  2.    low excitation only
  3.    both high and low excitation
  4.    none of the above
 Discuss Question
Answer: Option C. -> both high and low excitation
Question 45. The coupling angle or load angle of synchronous motor is defined as the angle between the
  1.    rotor and stator teeth
  2.    rotor and the stator poles of opposite polarity
  3.    rotor and the stator poles of the same polarity
  4.    none of the above
 Discuss Question
Answer: Option B. -> rotor and the stator poles of opposite polarity
Question 46. The armature current of the synchronous motor
  1.    has large values for low excitation i niy
  2.    has large values for high excitation only
  3.    has large values for low and high excitation
  4.    any of the above
 Discuss Question
Answer: Option C. -> has large values for low and high excitation
Question 47. If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor
  1.    become more
  2.    become less
  3.    remain constant
  4.    none of the above
 Discuss Question
Answer: Option B. -> become less
Question 48. The maximum value of torque that a synchronous motor can develop without losing its synchronism, is known as
  1.    slip torque
  2.    pull-out torque
  3.    breaking torque
  4.    synchronising torque
 Discuss Question
Answer: Option D. -> synchronising torque
Question 49. Exciters of synchronous machines are
  1.    d.c. shunt machines
  2.    d.c. series machines
  3.    d.c. compound machines
  4.    any of the above
 Discuss Question
Answer: Option A. -> d.c. shunt machines
Question 50. A synchronous motor running with normal excitation adjusts to load increases essentially by increase in
  1.    back e.m.f.
  2.    armature current
  3.    power factor
  4.    torque angle
 Discuss Question
Answer: Option B. -> armature current

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