Question

Download Solution PDF

The SCR shown in figure has a  limit of 10 A/μs. It is to be operated from a 100 V dc supply with load resistance R = 50 Ω. What is the minimum value of load inductance L that will protect the SCR?

  1. 10 mH
  2. 10 μH
  3. 100 mH
  4. 100 μH

Answer (Detailed Solution Below)

Option 2 : 10 μH
Free Tests
View all Free tests >
Free
ST 1: UPSC ESE (IES) Civil - Building Materials
20 Qs. 40 Marks 24 Mins
Start Now

Detailed Solution

Download Solution PDF

RL = 50 Ω

Download Solution PDF
Latest UPSC IES Updates

Last updated on Jul 2, 2025

-> ESE Mains 2025 exam date has been released. As per the schedule, UPSC IES Mains exam 2025 will be conducted on August 10. 

-> UPSC ESE result 2025 has been released. Candidates can download the ESE prelims result PDF from here.

->  UPSC ESE admit card 2025 for the prelims exam has been released. 

-> The UPSC IES Prelims 2025 will be held on 8th June 2025.

-> The selection process includes a Prelims and a Mains Examination, followed by a Personality Test/Interview.

-> Candidates should attempt the UPSC IES mock tests to increase their efficiency. The UPSC IES previous year papers can be downloaded here.

Exams Tests Super Practice

More Characteristics of Thyristor Questions

Q1.For normal SCRs turn on time is:
Q2.Consider the following statements regarding Thyristor: 1. It conducts when forward biased and positive current flows through the gate 2. It conducts when forward biased and negative current flows through the gate 3. It commutates when reverse biased and negative current flows through the gate 4. It commutates when the gate current is withdrawn Which of these statement(s) is/are correct?
Q3.For thyristor operation, following statements are given: (i) The supply voltage must be greater than the forward break overvoltage. (ii) The supply voltage must be less than the forward break overvoltage. (iii) ILatching < Iholding (iv) ILatching > Iholding Which of the above statements are correct? Choose the correct answer from the code given below:
Q4.The SCR shown in figure has a \(\frac{di}{dt}\) limit of 10 A/μs. It is to be operated from a 100 V dc supply with load resistance R = 50 Ω. What is the minimum value of load inductance L that will protect the SCR?
Q5.Circuit turn off time of an SCR is defined as the time

More Thyristors Questions

Q1.If the latching current of a thyristor is 4 mA and it is connected in series with a purely inductive load of 0.2 H across a DC voltage of 200 V. What should be the minimum width of the pulse to properly turn on the thyristor?
Q2.The voltage applied to the gate terminal of a thyristor is a rectangular pulse of 12 V with a period of 50 us and a duty cycle of 0.2. What is the average power loss in the gate circuit, if the peak gate power loss is 5 W?
Q3.The GTO is a _______ device.
Q4.Which of the following is a safety device connected in series to the circuit?
Q5.The switching point of the SCR is controlled by the values of the two power supply resistances Rs and Rw. Adding more tub ties
Q6.It is the maximum instantaneous voltage that the SCR can block in the forward direction. If it is exceeded, the SCR will conduct without a gate voltage. What is it?
Q7.Which of the following does the given symbol represent? 
Q8.In order to force equal sharing of voltages across the two SCRs (Silicon Controlled Rectifiers) connected in a series, which of the following should be connected across each thyristor?
Q9.The thermal energy that the Silicon Controlled Rectifier (SCR) can absorb for a short time, before the fault is cleared by the fuse, is measured by:
Q10.Which of the following is the most popular method for triggering the thyristor?
Suggested Test Series
View All >
UPSC ESE (IES) Civil Mock Test Series
116 Total Tests with 1 Free Tests
Start Free Test
UPSC ESE (IES) Electrical Mock Test Series
68 Total Tests with   0 Free Tests
Start Free Test

UPSC IES Important Links

ResultHall TicketEligibilitySalary and Job ProfileExam PatternECE Syllabus

More Power Electronics and Drives Questions

Q1.If the latching current of a thyristor is 4 mA and it is connected in series with a purely inductive load of 0.2 H across a DC voltage of 200 V. What should be the minimum width of the pulse to properly turn on the thyristor?
Q2.A fully controlled single-phase bridge rectifier is feeding a highly inductive load such that the load current is continuous. If the firing angle is set at 120°, then the average load voltage is ________ and the load current is ________.
Q3.The voltage applied to the gate terminal of a thyristor is a rectangular pulse of 12 V with a period of 50 us and a duty cycle of 0.2. What is the average power loss in the gate circuit, if the peak gate power loss is 5 W?
Q4.In which type of forced commutation method is the thyristor self-commutated by an LC circuit?
Q5.Which of the following devices can withstand bipolar voltages?
Q6.The GTO is a _______ device.
Q7.At higher forward voltages, a junction diode is likely to ________.
Q8.Which of the following is a safety device connected in series to the circuit?
Q9.A chopper-stabilized amplifier circuit eliminates the effects of 
Q10.The switching point of the SCR is controlled by the values of the two power supply resistances Rs and Rw. Adding more tub ties
Testbook Edu Solutions Pvt. Ltd.
1st & 2nd Floor, Zion Building,
Plot No. 273, Sector 10, Kharghar,
Navi Mumbai - 410210
support@testbook.com
Toll Free:1800 833 0800
Office Hours: 10 AM to 7 PM (all 7 days)
Company
About usCareers We are hiringTeach Online on TestbookPartnersMediaSitemap
Products
Test SeriesTestbook PassOnline CoursesOnline VideosPracticeBlogRefer & EarnBooks
Copyright © 2014-2022 Testbook Edu Solutions Pvt. Ltd.: All rights reserved
User PolicyTermsPrivacy
Hot Links： online teen patti teen patti classic teen patti yono teen patti