Sail E0 Webinar

MCQs

Total Questions : 395 | Page 34 of 40 pages
Question 331. . The efficiency of a properly desiged synchronous motor will usually fall in range
  1.    60 to 70%
  2.    75 to 80%
  3.    85 to 95%
  4.    99 to 99.5%
 Discuss Question
Answer: Option C. -> 85 to 95%
Question 332. .  Slip-rings in a synchronous motor carry
  1.    direct current
  2.    alternating current
  3.    no current
  4.    all of the above
 Discuss Question
Answer: Option A. -> direct current
Question 333. . The speed of the synchronous motor
  1.    increases with increase in load
  2.    decreases as load increases
  3.    varies with power factor
  4.    always remains constant
 Discuss Question
Answer: Option D. -> always remains constant
Question 334. . Dust and dirt accumulation on motor winding will result in
  1.    rise in winding temperature
  2.    increased core losses
  3.    shorting of coils
  4.    eddy current flow
 Discuss Question
Answer: Option A. -> rise in winding temperature
Question 335. . A synchronous machine with large air gap has
  1.    a higher value of stability limit
  2.    a small value of inherent regulation
  3.    a higher synchronizing power which makes the machine less sensitive to load variations
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 336. . The armature current of the synchronous motor has higher values for
  1.    high excitation only
  2.    low excitation only
  3.    both (a) and (b)
  4.    none of the above
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 337. .  In a synchronous motor running with fixed excitation, when the load is increased three times, its torque angle becomes approximately
  1.    one-third
  2.    twice
  3.    thrice
  4.    six times
 Discuss Question
Answer: Option C. -> thrice
Question 338. . Power factor of a synchronous motor is unity when
  1.    the armature current is maximum
  2.    the armature current is minimum
  3.    the armature current is zero
  4.    none of the above
 Discuss Question
Answer: Option B. -> the armature current is minimum
Question 339. . The angle between the rotating stator flux and rotor poles is called angle.
  1.    torque
  2.    obtuse
  3.    synchronizing
  4.    power factor
 Discuss Question
Answer: Option A. -> torque
Question 340. .  Which of the following methods is used to start a synchronous motor?
  1.    Damper winding
  2.    Star-delta starter
  3.    Damper winding in conjuction with star-delta starter
  4.    Resistance starter in the armature circuit
 Discuss Question
Answer: Option C. -> Damper winding in conjuction with star-delta starter

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 Mock Test SAIL JO E-0 2024
Chapter 3.1 : INTRODUCTION Chapter 3 : Sinter Plant SAIL E0 - GPOE/GPA 2024
Chapter 2.3 : COAL HANDLING PLANT - Set 1 Chapter 2 : Coke Ovens and Coal Chemicals SAIL E0 - GPOE/GPA 2024
Chapter 1.1 : INTRODUCTION Chapter 1 : Raw Material Handling Plant SAIL E0 - GPOE/GPA 2024
DSP Combined 1 Free Revision Test SAIL JO E-0