Sail E0 Webinar

MCQs

Total Questions : 202 | Page 7 of 21 pages
Question 61. An SCR is considered to be a semi controlled device because
  1.     it can be turned OFF but not ON with a gate pulse.
  2.     it conducts only during one half cycle of an alternating current wave.
  3.     it can be turned ON only during one half cycle of an AC.
  4.     it can be turned ON but not OFF with a gate pulse.
 Discuss Question
Answer: Option D. ->  it can be turned ON but not OFF with a gate pulse.
Question 62. A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is
  1.     60° to 180°.
  2.     30° to 180°.
  3.     30° to 150°.
  4.     60° to 120°.
 Discuss Question
Answer: Option C. ->  30° to 150°.
Question 63. A single phase full bridge inverter can operated in load commutation mode in case load consist of
  1.     RLC underdamped.
  2.     RLC overdamped.
  3.     RLC critically damped.
  4.     RL.
 Discuss Question
Answer: Option A. ->  RLC underdamped.
Question 64. An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be
  1.     6000 A.
  2.     4242.64 A.
  3.     2121.32 A.
  4.     1500 A.
 Discuss Question
Answer: Option C. ->  2121.32 A.
Question 65. Which statement is true for latching current ?
  1.     It is related to turn off process of the device.
  2.      It is related to turn on process of the device.
  3.     Both C and D.
  4.     It is related to conduction process of device.
 Discuss Question
Answer: Option B. ->   It is related to turn on process of the device.
Question 66. If holding current of a thyristor is 2 mA then latching current should be
  1.     0.009 A.
  2.     0.01 A.
  3.     0.002 A.
  4.      0.004 A.
 Discuss Question
Answer: Option D. ->   0.004 A.
Question 67. In forward blocking mode of a thyristor
  1.      junction J3 is in forward bias and J1, J2 is in reverse bias.
  2.      Junction J1, J3 is in reverse bias and J2 is in forward bias.
  3.      Junction J1 and J2 is in forward bias and J3 is in reverse bias.
  4.      junction J2 is in reverse bias and J1, J3 is in forward bias.
 Discuss Question
Answer: Option D. ->   junction J2 is in reverse bias and J1, J3 is in forward bias.
Question 68. In reverse blocking mode of a thyristor
  1.     junction J1 and J2 is in forward bias and J3 is in reverse bias.
  2.     junction J2 is in reverse bias and J1, J3 is in forward bias.
  3.     junction J3 is in forward bias and J1, J2 in reverse bias.
  4.      junction J1, J3 is in reverse bias and J2 is in forward bias.
 Discuss Question
Answer: Option D. ->   junction J1, J3 is in reverse bias and J2 is in forward bias.
Question 69. Leakage current flows through the thyristor in
  1.     forward conduction mode.
  2.      both forward and reverse blocking mode.
  3.     forward blocking mode.
  4.     reverse blocking mode.
 Discuss Question
Answer: Option B. ->   both forward and reverse blocking mode.
Question 70. Which triggering is the most reliable?
  1.      dV / dt triggering.
  2.      Forward voltage triggering.
  3.      Gate triggering.
  4.      Thermal triggering.
 Discuss Question
Answer: Option C. ->   Gate triggering.

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