Online TestThyristor Protection Questions and Answers Thyristor Protection Questions and Answers Power Electronics Objective Questions & Answers 0% The dv/dt protection is provided in order to reduce the junction temperature limit the power loss avoid accidental turn-on of the device avoiding sudden large voltage across the load 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 >> 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 + e-t/τ) I(1 + e-t/τ) I(1 – e-t/τ) I(1 – et/τ) Correct!Wrong!- Continue >> 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 >> The local hot spot formation in the cross-section of the SCR is avoided by using only R loads proper mounting of the SCR on heat sink applying gate current nearer to the maximum gate current reducing the junction temperature Correct!Wrong!- Continue >> Thyristors are used in electronic crowbar protection circuits because it possesses voltage clamping properties high amp 2-sec rating less switching losses high surge current capabilities Correct!Wrong!- Continue >> The thyristor has the following specifications Vs = 400 V (di/dt)max = 25 A/μsec Find the value of L 160 μH 8 μH 80 μH 16 μH Correct!Wrong!- Continue >> dv/dt protection is provided to the SCR by connecting a capacitor in parallel with the load connecting an inductor in series with the load connecting an inductor & resister in parallel with the device connecting a capacitor & resister in parallel with the device Correct!Wrong!- Continue >> The effect of over-voltages on SCR are minimized by using Varistors Circuit breakers di/dt inductor RL circuits Correct!Wrong!- Continue >> Over-current protection in SCRs is achieved through the use of Zener diodes Snubber Circuits F.A.C.L.F & C.B. Varistors 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 ↺ PLAY AGAIN ! Share With Your Friends Facebook Twitter LinkedIn Pinterest Email WhatsApp
