Sail E0 Webinar

MCQs

Total Questions : 202 | Page 8 of 21 pages
Question 71. If a latching current for the circuit shown in figure is 2 mA. Obtain the value of minimum width of the property turn ON the SCR?
  1.     3 µs.
  2.      3.3 µs
  3.     3.1 µs
  4.     3.2 µs
 Discuss Question
Answer: Option B. ->   3.3 µs
Question 72. Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then
  1.     Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.
  2.      Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.
  3.     Vc1 = Vc2 = Vc3 any value of Ig.
  4.     Vc1 > Vc2 > Vc3 when Ig1= Ig2
 Discuss Question
Answer: Option B. ->   Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.
Question 73. Light triggering mainly used in
  1.     low - voltage direct current transmission.
  2.      high voltage direct current transmission.
  3.      all of these.
  4.     medium voltage direct current transmission.
 Discuss Question
Answer: Option B. ->   high voltage direct current transmission.
Question 74. In a P1N1P2N2 thyristor which layer is less doped ?
  1.     P2.
  2.     N2.
  3.     P1.
  4.      N1.
 Discuss Question
Answer: Option D. ->   N1.
Question 75. SCR will be turned off when anode current is
  1.     < latching current but greater than holding current and gate signal is present.
  2.      both (A) and (B).
  3.     less than holding current.
  4.      < latching current but greater than holding current and gate signal is 0.
 Discuss Question
Answer: Option B. ->   both (A) and (B).
Question 76. For an SCR gate cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance?
  1.     115 ohm
  2.     108 ohm
  3.     11.19 ohm
  4.      111.9 ohm
 Discuss Question
Answer: Option D. ->   111.9 ohm
Question 77. After proper turn on of thyristor
  1.    None of these
  2.     gate signal should present but can be removed.
  3.     gate signal is always present.
  4.      gate signal must be removed.
 Discuss Question
Answer: Option D. ->   gate signal must be removed.
Question 78. A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is
  1.     65.
  2.     60.
  3.     3.714.
  4.      37.14.
 Discuss Question
Answer: Option D. ->   37.14.
Question 79. Gate circuit or triggering circuit of a thyristor is
  1.      lower power circuit.
  2.     may be low power or high power circuit.
  3.     high power circuit.
  4.     magnetic circuit.
 Discuss Question
Answer: Option A. ->   lower power circuit.
Question 80. Latching current for an SCR inserted between a dc voltage source of 200 V and load is 100 mA. Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 20 Ω in series with L = 0.2 H.
  1.      100 µs.
  2.     150 µs.
  3.     200 µs.
  4.     300 µs.
 Discuss Question
Answer: Option A. ->   100 µs.

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

DSP Combined 1 Free Revision Test SAIL JO E-0
GPOE / GPA Combined 1 Free Revision Test SAIL JO E-0
BSP Plant Specific Review Test SAIL JO E-0
BSL Combined 1 Free Revision Test SAIL JO E-0
GFM Combined 1 Free Revision Test SAIL JO E-0