Sail E0 Webinar

MCQs

Total Questions : 395 | Page 8 of 40 pages
Question 71. Synchronous motors are
  1.    Not-self starting
  2.    Self-starting
  3.    Essentially self-starting
  4.    None of the above
 Discuss Question
Answer: Option A. -> Not-self starting
Question 72. The standard full-load power factor ratings for synchronous motors are
  1.    zero or 0.8 leading
  2.    unity or 0.8 lagging
  3.    unity or 0.8 leading
  4.    unity or zero
 Discuss Question
Answer: Option C. -> unity or 0.8 leading
Question 73. If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then
  1.    the stator current will be zero
  2.    the stator current will be very small
  3.    the stator current will be very high
  4.    the back e.m.f. will be more than the supply voltage
 Discuss Question
Answer: Option A. -> the stator current will be zero
Question 74. The construction of a synchronous motor resembles
  1.    a series motor
  2.    an induction motor
  3.    an alternator
  4.    a rotary converter
 Discuss Question
Answer: Option C. -> an alternator
Question 75. The speed regulation of a synchronous motor is always
  1.    1%
  2.    0.5%
  3.    positive
  4.    zero
 Discuss Question
Answer: Option D. -> zero
Question 76. A three-phase synchronous motor will have
  1.    no slip-rings
  2.    one slip-ring
  3.    two slip-rings
  4.    three slip-rings
 Discuss Question
Answer: Option C. -> two slip-rings
Question 77. The operating speed of a synchronous motor can be changed to new fixed value by
  1.    changing the load
  2.    changing the supply voltage
  3.    changing frequency
  4.    using brakes
 Discuss Question
Answer: Option C. -> changing frequency
Question 78. The minimum armature current of the synchronous motor corresponds to operation at
  1.    zero power factor leading
  2.    unity power factor
  3.    0.707 power factor lagging
  4.    0.707 power factor leading
 Discuss Question
Answer: Option B. -> unity power factor
Question 79. If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then
  1.    it runs at a slower speed
  2.    the motor stops
  3.    it continues to run at the same speed
  4.    it runs at a very high speed
 Discuss Question
Answer: Option B. -> the motor stops
Question 80. A synchronous motor can be started by
  1.    pony motor
  2.    D.C. compound motor
  3.    providing damper winding
  4.    any of the above
 Discuss Question
Answer: Option D. -> any of the above

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