6 AC and DC circuit breakingDC circuit breakers and AC breaker main difference isthe ability to arc. Because the exchange of each cycle,have had zero, zero easy to extinction in the past, buthas not been zero DC switching, arc extinguishingability is poor, so to add additional interrupter device.DC arc is generally difficult, but the exchange has zero,breaking easily. Exchange can be derived for the DCcircuit breaker protection, attention to three changes: 1,overload and short circuit protection.1. long delay overload protection.characteristics, dc short circuit current (or evenmultiple small fault current) is breaking; arc out all thedifficulties, so wiring should be two extreme ways orthree poles in series increase the fracture, so that thefracture energy to bear part of the arc.DC arcs are to be interrupted by increasing theresistance interruption method in which resistance ofthe arc is increased so that the arc voltage can no longermaintain the current and the arc is extinguished.• Size of DC circuit breaker increases as the voltage levelincreases.23. A Boolean function that is implemented using the programmable array logic(PAL) can be also implemented using:a. Programmable logic array (PLA)b. ROMc. PROMd. All of the above24. Given the following Boolean functions:F, (A, B, C) = A'B' + AC' + ABCF2 (A, B, C) = (B'c + ABC)'In implementing these functions using a programmable logic array (PLA), wewill need:a. Four AND gates and two OR gatesb. Two AND gates and four OR gatesc. Four AND gates and four OR gatesd. Two AND gates and Two OR gates

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AC and DC circuit breaking DC circuit breakers and AC breaker main difference is the ability to arc. Because the exchange of each cycle, have had zero, zero easy to extinction in the past, but has not been zero DC switching, arc extinguishing ability is poor, so to add additional interrupter device. DC arc is generally difficult, but the exchange has zero, breaking easily. Exchange can be derived for the DC circuit breaker protection, attention to three changes: 1, overload and short circuit protection. 1. long delay overload protection. characteristics, dc short circuit current (or even