In a 3 phase fully controlled converter the firing frequency is (A) 3 times the line frequency. This light dimmer circuit is built with various electrical and electronic components like resistors R1=68 kilo ohms, R2=280 kilo ohms and R3=10 kilo ohms, variable resistors VR1=100 kilo ohms and VR2=200 kilo ohms, capacitors C1, C2 and C3=0.33 uF/400V, TRIAC is BT136 and DIAC is ER900. Its primary function is to control power bilaterally in an AC circuit. A DIAC is a diode that conducts electrical current only after its breakover voltage (V BO) has been reached.DIAC stands for âDiode for Alternating Currentâ. The DIAC is an electronics component that is widely used to assist even triggering of a TRIAC when used in AC switches and as a result they are often found in light dimmers such as those used in domestic lighting. (B) 6 times the line frequency. The name DIAC comes from the words DIode AC switch. Note. It is a bidirectional device, means it can conduct current in both the directions. This contains 25 Multiple Choice Questions for Electrical Engineering (EE) Test: Power Electronics - 6 (mcq) to study with solutions a complete question bank. The TRIAC is 5 layer, 3 terminal Power semiconductor device. The triac is fabricated by integrating two thyristors in an inverse parallel connection. A triac is a bidirectional, three-terminal dual, back-to-back Thyristor (SCR) switch. It has a pair of phase controlled SCRs connected in inverse parallel manner on the same chip. When triodes have different turn-on voltages for both directions in phase control circuits, non-symmetrical firing occurs. The best solution is to provide a discharge path. The Following Section consists Multiple Choice Questions on Thyristors and Tranducers. MCQ in Industrial Electronics Part 2 of the series as Electronics Engineering topic in ECE Board Exam. (C) 9 times the line frequency. A pinoybix mcq, quiz and reviewers. You can do that by connecting either a capacitor or the DIAC with a high-value resistor in series between the primary and gate devices. This device can switch the current in either direction by applying a small current of either polarity between the gate and main terminal two. Due to the bidirectional control capability of both TRIAC and DIAC, it is possible to control the firing angle of the TRIAC in both positive and negative peaks of the input. Introduction about Triac: TRIAC = TRIode for Alternating Current. 6. The solved questions answers in this Test: Power Electronics - 6 quiz give you a good mix of easy questions and tough questions. Light Dimmer Circuit Using Triac. Non-Symmetrical Firing. 3. What is a DIAC. Take the Quiz and improve your overall Engineering. A DIAC is a device which has two electrodes, and it is a member of the thyristor family. Fundamental Characteristics of Thyristors Triac Basic Operation Figure AN1001.4 shows the simple block construction of a Triac. 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