In an AC-DC converter, silicone-controlled rectifier (SCR) operates as A. Freewheeling diode. B. Voltage source. C. Filter. D. Phase angle controller. 6. 7. The SCR can be turned on A. And off by applying gate pulse. B. By applying gate pulse and turned off by removing the gate pulse. C. By making the current of the power circuit to non-zero and turned off by making it zero. D. By applying gate pulse and turned off by reversing the current of the power circuit. 8. TRIAC is semiconductor device that has A. Two SCRS that connected in parallel. B. Two SCRS that connected in series. C. Two SCRS that connected in reverse parallel D. None above. 9. The power semiconductor that has no gate terminal. A. SCR В. Diode C. MOSFET D. MCT 10. Snubber circuit is used to A. Filter electromagnetic interference (EMI) noise. B. Create stray inductance. C. Eliminate voltage / current spike during tun on /off power switches. D. Increase switching capability of the power switches.

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Latches and Flip Flop

Just like logic gates, the latches and flip-flops are the important elements of an electronic circuit. The logic gates form the important part of combinatorial circuits, while the latches and flip-flops form the essential part of a sequential circuit. Sequential circuits form the important concept of automata theory in electronics and electrical engineering, these circuits are a kind of logic circuit whose output depends on both present input and past inputs, that is, the input history.