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The dv/dt rating of SCR can be improved by using
Answer: a Explanation: Cathode shorts are realized by overlapping metal on cathode n+ layers with a narrow p-region in between.
Answer: a
Explanation: Cathode shorts are realized by overlapping metal on cathode n+ layers with a narrow p-region in between.
See lessInter-digitating of gate-cathode regions in SCR devices improves the
Answer: b Explanation: Inter-digitating is the inter-mixing of the gate-cathode area to improve the di/dt ratings. di/dt rating is improved by providing more cathode conduction area during the delay and rise time.
Answer: b
Explanation: Inter-digitating is the inter-mixing of the gate-cathode area to improve the di/dt ratings. di/dt rating is improved by providing more cathode conduction area during the delay and rise time.
See lessThe usual way to accomplish higher gate current for improved di/dt rating is by using
Answer: b Explanation: Pilot SCR is an SCR which is fired which activates the firing circuit and fires the main SCR.
Answer: b
Explanation: Pilot SCR is an SCR which is fired which activates the firing circuit and fires the main SCR.
See lessThyristors are used in electronic crowbar protection circuits because it possesses
Answer: a Explanation: Crowbar protection circuits have high surge current capabilities
Answer: a
Explanation: Crowbar protection circuits have high surge current capabilities
See lessThe thyristor has the following specifications Vs = 400 V (di/dt)max = 25 A/μsec Find the value of L
Answer: c Explanation: As soon as the switch is closed, C acts like a S.C & the voltage equation gives, Vs = (Rs + Rl) I + L di/dt Solve the above D.E. di/dt = Vs/L e-t/τ di/dt is maximum at t = 0, substitute the above given values & find L
Answer: c Explanation: As soon as the switch is closed, C acts like a S.C & the voltage equation gives, Vs = (Rs + Rl) I + L di/dt Solve the above D.E. di/dt = Vs/L e-t/τ di/dt is maximum at t = 0, substitute the above given values & find L
See lessFalse triggering of the SCRs by varying flux & noise is avoided by using
Answer: b Explanation: Shielded cables provide isolation from outside noise
Answer: b Explanation: Shielded cables provide isolation from outside noise
See lessOver-current protection in SCRs is achieved through the use of
Answer: c Explanation: FACLF stands for Fast Acting Current Limiting Fuse.
Answer: c Explanation: FACLF stands for Fast Acting Current Limiting Fuse.
See lessThe effect of over-voltages on SCR are minimized by using
Answer: c Explanation: Varistors are non-linear voltage clamping devices, RC circuits across the loads can also be used
Answer: c Explanation: Varistors are non-linear voltage clamping devices, RC circuits across the loads can also be used
See lessFigure below shows SCR having dv/dt and di/dt protection, when the switch(shown in green) is closed the current through Rl =
Answer: a Explanation: As soon as the switch is closed, C acts like a S.C & the voltage equation gives Vs = (Rs + Rl) I + L di/dt Solve the above D.E.
Answer: a Explanation: As soon as the switch is closed, C acts like a S.C & the voltage equation gives Vs = (Rs + Rl) I + L di/dt Solve the above D.E.
See lessdv/dt protection is provided to the SCR by
Answer: c Explanation: Snubber circuit R-C in parallel with SCR is connected for dv/dt protection.
Answer: c Explanation: Snubber circuit R-C in parallel with SCR is connected for dv/dt protection.
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