Home / Online Test / Thyristor Protection Questions and Answers Online Test Thyristor Protection Questions and Answers S Bharadwaj ReddyLeave a comment Thyristor Protection Questions and Answers Power Electronics Objective Questions & Answers 0% False triggering of the SCRs by varying flux & noise is avoided by using Snubber circuits Shielded cables & twisted gate leads F.A.C.L.F & C.B di/dt inductor in series with the gate terminal Correct! Wrong! - Continue >> Over-current protection in SCRs is achieved through the use of F.A.C.L.F & C.B. Snubber Circuits Zener diodes Varistors Correct! Wrong! - Continue >> di/dt protection is provided to the thryistor by connecting an inductor in parallel across the load connecting an inductor in series with the load connecting an inductor in series with the gate connecting an inductor in parallel across the gate terminal Correct! Wrong! - Continue >> The effect of over-voltages on SCR are minimized by using Varistors RL circuits Circuit breakers di/dt inductor Correct! Wrong! - Continue >> dv/dt protection is provided to the SCR by connecting an inductor & resister in parallel with the device connecting a capacitor in parallel with the load connecting a capacitor & resister in parallel with the device connecting an inductor in series with the load Correct! Wrong! - Continue >> The thyristor has the following specifications Vs = 400 V (di/dt)max = 25 A/μsec Find the value of L 80 μH 8 μH 16 μH 160 μH Correct! Wrong! - Continue >> Figure below shows SCR having dv/dt and di/dt protection, when the switch(shown in green) is closed the current through Rl = I(1 – et/τ) I(1 + e-t/τ) I(1 + e-t/τ) I(1 – e-t/τ) Correct! Wrong! - Continue >> Thyristors are used in electronic crowbar protection circuits because it possesses high surge current capabilities voltage clamping properties less switching losses high amp 2-sec rating Correct! Wrong! - Continue >> The local hot spot formation in the cross-section of the SCR is avoided by using only R loads applying gate current nearer to the maximum gate current reducing the junction temperature proper mounting of the SCR on heat sink Correct! Wrong! - Continue >> The dv/dt protection is provided in order to avoiding sudden large voltage across the load reduce the junction temperature limit the power loss avoid accidental turn-on of the device Correct! Wrong! - Continue >> Share the quiz to show your results ! Facebook Facebook Just tell us who you are to view your results ! Show my results >> Thyristor Protection I got %%score%% of %%total%% right Share your results Facebook Facebook Twitter Google+ ↺ PLAY AGAIN ! Previous Post:Thyristor Ratings Questions and AnswersNext Post:Thyristor Mounting Questions and Answers Related Articles Online Test AC Voltage Controllers Objective Questions – 1 December 1, 2014 Online Test Programmable Read Only Memory Objective Questions – Part 2 May 1, 2015 Online Test Analog Modulators Objective Questions March 5, 2017 Online Test Electrical Machines Objective Questions – Set 12 December 2, 2014 Online Test Photo Electric Transducers Objective Questions February 3, 2017 Online Test Tomography Objective Questions April 2, 2017 Online Test Micro Sensors Objective Questions March 29, 2017 Online Test 1P-Diode Full Wave Rectifier Questions and Answers – Part 1 December 1, 2014 Online Test Applications of Polyphase Induction Motors January 2, 2015 Online Test Process Control & Instrumentation Objective Questions – Set 3 June 13, 2017 Online Test Power Systems Objective Questions & Answers – Set 19 January 3, 2015 Online Test Electric Circuits Objective Questions – Set 17 December 4, 2014 Also Read : Asynchronous Down Counter Objective Questions May 1, 2015 Ionization Transducers Objective Questions February 5, 2017 Power Electronics Objective Questions – Set 2 March 19, 2016 Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.