3.SCR can operate in only one quadrant of V-I characteristics. Register; Test; Home; Q&A; Unanswered; Categories; Ask a Question; Learn; Ask a Question. cursor: pointer; TRIAC . Learn Power Electronics MCQ questions & answers are available for a Electrical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. A distinction is made between the following four types of thyristors (Fig. Triac is a bidirectional device, i.e. The main difference between SCR and TRIAC is that SCR is a unidirectional device, TRIAC is a bidirectional device. 1. It is a unidirectional similar to a diode but switched like a transistor. Identification of the MT 1 and MT 2 terminals must be done via the TRIAC\’s part number with reference to a data sheet or book. Save my name, email, and website in this browser for the next time I comment. A WebSocket is still a socket, just one that runs in a web browser, and whose transmitted data has to be framed in a particular format according to the WebSocket spec. Login. It has been shown that the di/dt failure level is a function of the gate region geometry and is not necessarily related to the size of the silicon chips. omnidirectional A thyristor (/ θ aɪ ˈ r ɪ s t ər /) is a solid-state semiconductor device with four layers of alternating P-and N-type materials. TRIAC is a three terminal device. Question is ⇒ A TRIAC is a semiconductor device which acts as a, Options are ⇒ (A) 2 terminal unidirectional switch, (B) 2 terminal bidirectional switch, (C) 3 terminal bidirectional switch, (D) 4 terminal multidirectional switch, (E) , Leave your comments or Download question paper. Power Electronics MCQ question is the important chapter for a Electrical Engineering and GATE students. The SCR is unidirectional device. mechanical C . A socket is created as a bidirectional resource (capable of both sending and receiving), even if it is only used in a unidirectional manner in code. Thyristor needs two heat sink whereas TRIAC needs only one heat sink. A unidirectional Transient Voltage Suppressor Diode works as a rectifier in a circuit in the forward direction like any other avalanche diode, and this unidirectional diode is made to withstand very large peak currents. What are the advantages and disadvantages of embedded systems? • … TRIAC can operate in four different modes. TRIAC (Triode for Alternating Current)– bidirectional three-terminal element. As it conducts in both direction so it is named as MT1,MT2 and gate G. SALIENT FEATURES . There is however, another type of semiconductor device called a “Triode AC Switch” or Triac for short which is also a member of the thyristor family that be used as a solid state power switching device but more importantly it is a “bidirectional” device. TRIAC controls are more often seen in simple, low-power circuits than complex, high-power circuits. It is a unidirectional similar to a diode but switched like a transistor. here we will discuss Triac working and vi characteristics, In the SCR family, after the SCR, Triac is the most widely used device for power control. A TRIAC (triode for alternating current) is a silicone semiconductor component with three terminals or legs that allow current to flow in either direction when triggered. Triac is a three-terminal device, with the terminals named as main terminals 1, 2 (MT1 and MT2) and gate, out of which gate is the control terminal. It available in large ratings. The SCR conduct  current in one direction only. The SCR can be triggered by positive gate voltage only. We have also provided number of questions asked since 2007 and average weightage for each subject. MCQ in Industrial Electronics Part 3 of the series as Electronics Engineering topic in ECE Board Exam. The thyristor can be divided mainly due to its properties and then by the number of its terminals. Power Electronics MCQ question is the important chapter for a Electrical Engineering and GATE students. This Section covers below lists of topics : .kensFaq_questionListItem { TRIACs are a development of a similar family member the thyristor. A triac is almost similar to an SCR , but Triac is a bidirectional device whereas SCR is a unidirectional device like Diode. View Answer: Answer: Option D. ... Answer: Option C. Solution: 129. In this page you can learn various important diac questions answers,sloved questions on diac and lots of important mcq on diac etc. 200 V, 10 mA logic level TRIAC: FBI2A4S1 : FAGOR: 50 V, 2 A glass passivated bridge rectifier: 1.5SMC9V1CA : FAGOR : 9.1 V, 1 mA, 1500 W unidirectional and bidirectional surface mounted transient voltage suppressor diode: 5KP8.5 : FAGOR: 8.5 V, 5 mA, 5000 W unidirectional and bidirectional load dump glass passivated automotive T.V.S. Required fields are marked *. The main reason for the difference between SCR and TRIAC is its construction, where SCR is a Unidirectional semiconductor device, but TRIAC is a Bi-Directional semiconductor device. POWER ELECTRONICS Questions free download for freshers experienced. A thyristor is more reliable while TRIAC has less reliable. Correct! It is a bidirectional SCR with three terminal. It is a bidirectional SCR with three terminal. Thyristor needs two heat sink whereas TRIAC needs only one heat sink. TRIAC . The SCR control DC power. However, unlike the thyristor which is unidirectional the TRIAC is able to control current over both halves of the sine wave making TRIACs bidirectional. In SCR only one mode of operation is possible. The TRIAC control DC as well as AC power. 3.can operate in two quadrants of V-I characteristics. A thyristor is more reliable while TRIAC has less reliable. A Unijunction Transistor is a 3 terminal device with a single PN junction and is basically used to trigger a SCR or a TRIAC. Difference between feeder and distributer. It acts exclusively as a bistable switch, conducting when the gate receives a current trigger, and continuing to conduct until the voltage across the device is reversed biased, or until the voltage is removed (by some other means). Following are main difference between SCR (Silicon controlled rectifier)and TRIAC (Triode for alternating current) : Your email address will not be published. In this section of Electronic Devices and Circuits.It contain Power Handling Devices and Circuits MCQs (Multiple Choice Questions Answers).All the MCQs (Multiple Choice Question Answers) requires in depth reading of Electronic Devices and Circuits Subject as the … a vacuum 3 / 3 pts Question 6 The diac is a _____device. The internal layers and doping is done in such a way that the current can flow in both directions. A TRIAC (triode for alternating current) is a silicone semiconductor component with three terminals or legs that allow current to flow in either direction when triggered. The SCR control DC power. A thyristor (/ θ aɪ ˈ r ɪ s t ər /) is a solid-state semiconductor device with four layers of alternating P-and N-type materials. a. SCS. Bidirectional means data flows in both directions, whereas Unidirectional means data flows in only one direction. GATE 2019 EE syllabus contains Engineering mathematics, Electric Circuits and Fields, Signals and Systems, Electrical Machines, Power Systems, Control Systems, Electrical and Electronic Measurements, Analog and Digital Electronics, Power Electronics and Drives, General Aptitude. • It is a bidirectional switch. Thyristors are used to control high voltages and currents in the motors, heating and lighting applications. Remember. TRIAC function by either positive or negative gate control voltage. Unidirectional SCRs have a cathode (K), an anode (A), and a gate (G). In this section of Electronic Devices and Circuits.It contain Power Handling Devices and Circuits MCQs (Multiple Choice Questions Answers).All the MCQs (Multiple Choice Question Answers) requires in depth reading of Electronic Devices and Circuits Subject as the hardness level of MCQs have been kept to advance level.These Sets of Questions are very helpful in Preparing for various Competitive Exams and University level Exams. A TRIAC acts much like two SCRs connected back-to-back for bidirectional (AC) operation. The operation of the shaded pole electric motor and brake disclosed in FIG. The MOSFET is a bidirectional device, from the point of view that the terminals called the ‘Source’ and ‘Drain’ can be interchanged. For both positive and negative gate currents, traic conducts but with only direction on gate current turn ON the SCR. Then a triac has four possible triggering modes of operation as follows. US3418558A US386859A US38685964A US3418558A US 3418558 A US3418558 A US 3418558A US 386859 A US386859 A US 386859A US 38685964 A US38685964 A US 38685964A US 3418558 A US3418558 A US 3418558A Authority US United States Prior art keywords circuit load triac power scr Prior art date 1963-12-27 Legal status (The legal status is an assumption and is not a legal conclusion. A triac is a _____ switch a) Bidirectional b) Unidirectional c) Mechanical d) None of the above The SCR can be triggered by positive gate voltage only. padding-left: 0px; Cheap New domestic triac tpdv1240 high frequency bidirectional control,You can get more details about New domestic triac tpdv1240 high frequency bidirectional control:Shopping Guide on Alibaba.com Bidirectional means data flows in both directions, whereas Unidirectional means data flows in only one direction. The TRIAC Is Equivalent To .. A. TRIAC function by either positive or negative gate control voltage. The di/dt capability of unidirectional triode thyristors (SCR's) has been investigated [3,4]. TRIAC TRIAC, from Triode for Alternating Current, is a genericized tradename for an electronic component that can conduct current in either direction when it is triggered, and is formally called a bidirectional triode thyristor or bilateral triode thyristor. c. UJT ... d. 3 terminal bidirectional switch. How does it work? The application of bidirectional triode thyristors (triacs) to industrial power control has become more common. 5 views. The TRIAC can be triggered either by positive or negative gate voltage. It available in smaller ratings. SCR is a: Unidirectional switch; Bidirectional switch; Four-directional; None of the above; 54. b. Conducts when not triggered in both directions. Energy is supplied to terminals 10 and 11 to electrically energize the entire motor. TRIAC 1.It is a bi-directional device. In the condition shown in FIG. A TRIAC (triode for alternating current) is a silicone semiconductor component with three terminals or legs that allow current to flow in either direction when triggered. the current can flow in both the directions through it. Triac may refer to: TRIAC (triode for alternating current), an electronics component; Triac (car), a green vehicle; Tiratricol, a common thyroid hormone analogue used for treating thyroid hormone resistance syndrome; This disambiguation page lists articles associated with the title Triac. TRIAC=TRIODE+AC . TRIAC. bidirectional D . engineering college students follow good questions get job TRIAC can control both positive and negative half cycles of AC signal input. Here it is considered to be two SCRS connected in anti parallel. TRIAC can conduct in both directions; it can thus be described as a bidirectional device. DIAC (Diode for Alternating Current)– bidirectional two-terminal element, 4. A TRIAC can be used only in: Chopper; Inverter; Multi quadrant chopper; None of the above; 53. In SCR only one mode of operation is possible. SCRs are unidirectional (one-way) current devices, making them useful for controlling DC only. TRIAC, from Triode for Alternating Current, is a genericized tradename for an electronic component that can conduct current in either direction when it is triggered (turned on), and is formally called a bidirectional triode thyristor or bilateral triode thyristor.. TRIACs belong to the thyristor family and are closely related to Silicon-controlled rectifiers (SCR). What is bidirectional flow? In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well: The normal way to turn on a diac is by _____. TRIAC=TRIODE+AC . TRIAC can operate in four different modes. A Four-layer Diode B. A WebSocket is still a socket, just one that runs in a web browser, and whose transmitted data has to be framed in a particular format according to the WebSocket spec. 200 V, 35 mA high commutation TRIAC: BZV58C24 : FAGOR: 24 V, 50 mA, 5 W glass passivated zener diode: 1.5SMC75CA : FAGOR : 75 V, 1 mA, 1500 W unidirectional and bidirectional surface mounted transient voltage suppressor diode: FBI2F5S2 : FAGOR: 300 V, 2 A glass passivated bridge rectifier: RGP08B : FAGOR: 100 V, 1 A glass passivated fast recovery rectifier: BZW04-64B : FAGOR: 75 V, 1 mA, … The TRIAC control DC as well as AC power. (Note that SCR is a unidirectional device). A thyristor is available in a large rating while in TRIAC available in smaller ratings. Diac and Triac are which type of devices: Unidirectional, Unidirectional Unidirectional, Bidirectional Bidirectional, Unidirectional Bidirectional, Bidirectional Correct answer: 4. It conducts in both direction. In basic terms a TRIAC is a low power to medium power semi-latching solid state switch. A unidirectional-three terminal device, the most popular of thyristors. The TRIAC can be triggered either by positive or negative gate voltage. It is effectively a development of the SCR or thyristor, but unlike the thyristor which is only able to conduct in one direction, the TRIAC is a bidirectional device. The TRIAC conduct  current in both the directions. • The forward and reverse characteristics of TRIAC is similar to forward characteristics of SCR device. TRIAC Optocouplers Regulators ... and the other is Bidirectional. volume time POWER ELECTRONICS Questions free download for freshers experienced. Review. b. Triac. Correct! Two Diacs In Parallel C. A Transistor With A Gate Lead D. Two SCRs In Inverse-parallel Choose from 29 different sets of bidirectional flashcards on Quizlet. The main difference between SCR and TRIAC is that SCR is a unidirectional device, TRIAC is a bidirectional device. In TRIAC  four different modes of operation is possible. ... 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Your email address will not be published. 4. TRIAC is a: Unidirectional Switch; Bidirectional switch; Four-directional; None of the above; 55. TRIACs are a development of a similar family member the thyristor. unidirectional B . a. Conducts when not triggered. TRIACs are a development of a similar family member the thyristor. TRIACs are a development of a similar family member the thyristor. The TRIAC is bidirectional device. for various interview, competitive examination and entrance test. list-style-type: upper-alpha; Both the unidirectional thyristor and the TRIAC have three terminals. It acts exclusively as a bistable switch, conducting when the gate receives a current trigger, and continuing to conduct until the voltage across the device is reversed biased, or until the voltage is removed (by some other means). Datasheet catalog for electronic components integrated circuit, transistor, diode, triac, and other semiconductors - Page 27191 It has 5 layers of semiconductor. 1 is as follows. In large power control circuits, multiple SCRs tend to be favored. 2.The gate current can be positive or negative. It conducts in both direction. As SCR is a unidirectional device, the conduction is from anode to cathode and not from cathode to anode. the atmospheric pressure at sea level Correct! This feature allows the use of standard buffer circuit for the gate control (see Figure 5). It can switch both halves of an AC waveform, that's why it is called a bidirectional device. Learn bidirectional with free interactive flashcards. A pinoybix mcq, quiz and reviewers. Datasheet catalog for electronic components integrated circuit, transistor, diode, triac, and other semiconductors - Page 21261 2.the gate current can be only positive. A unidirectional current control circuit means 40 is provided by the addition of a further resistor 43 and diode 44 which are placed in parallel with the triac 41. The triac can be used as a very flexible unidirectional or bidirectional switch in such a circuit. If bidirectional (AC) operation is desired, two Shockley diodes may be joined in parallel facing different directions to form a new kind of thyristor, the DIAC: (Figure below) unidirectional bidirectional Correct! It is very easy to understand and help you to improve your skill. Triode thyristor (SCR)– unidirectional three-terminal element, 3. Difference between SCR & Thyristor:- SCR 1.SCR is a unidirectional device. • It can control both positive and negative half cycles of AC signal input. A . The differences between diac and triac mainly include what are a diac and triac, construction of triac and diac, working, characteristics and applications. We now know that a “triac” is a 4-layer, PNPN in the positive direction and a NPNP in the negative direction, three-terminal bidirectional device that blocks current in its “OFF” state acting like an open-circuit switch, but unlike a conventional thyristor, the triac can conduct current in either direction when triggered by a single gate pulse. Gate current Gate … However, unlike the thyristor which is unidirectional the TRIAC is able to control current over both halves of the sine wave making TRIACs bidirectional. 3 / 3 pts Question 7 Pressure is measured as a force per unit of _____. A triac is a _____ switch Bidirectional Unidirectional Mechanical None of the above Correct! margin-left: 13px; Difference between Diac and Triac. The TRIAC control DC as well as AC power. Bidirectional, The SCR is unidirectional device. afrinperween620 afrinperween620 2 hours ago CBSE BOARD XII Secondary School A TRIAC is a_____ switch? Wrong! 3. 5/13 AN871 APPLICATION NOTE Figure 5. The TRIAC can be triggered either by positive or negative gate voltage. Unidirectional device c. Three-layer device d. Bidirectional device. Ι + Mode = MT2 current positive (+… A TRIAC is a three terminal switch. Dynistor– unidirectional two-terminal element, 2. The TRIAC is bidirectional device. Author has 93 answers and 39.3K answer views It can switch both halves of an AC waveform, that’s why it is called a bidirectional device. Bidirectional means data flows in both directions, whereas Unidirectional means data flows in only one direction. Bidirectional means data flows in both directions, whereas Unidirectional means data flows in only one direction. The SCR can be triggered by positive gate voltage only. Answer to A triac is a _____ switch . The diac is a a. Transistor b. Unidirectional device c. Three-layer device d. Bidirectional device ← Prev Question Next Question → 0 votes . It available in large ratings. It is a unidirectional device. • It has 5 layers of semiconductor. Figure-3 depicts structure and symbol of TRIAC. • It is a three terminal semiconductor device. Correct! • Contruction of TRIAC is equivalent to 2 separate SCR devices connected in inverse parallel as shown in the figure. • The name "TRIAC" is derived from combination of "TRI" means three and "AC" or alternating current. However, unlike the thyristor which is unidirectional the TRIAC is able to control current over both halves of the sine wave making TRIACs bidirectional. A thyristor is available in a large rating while in TRIAC available in smaller ratings. The DIAC Is A .. A. Transistor B. Unidirectional Device C. Four-layer Device D. Bidirectional Device 39. Used as a very flexible unidirectional or bidirectional switch in such a way the. Control ( See figure 5 ) can switch both halves of an AC,! Reverse characteristics of SCR device register ; test ; Home ; Q & a ; Unanswered ; Categories ; a. Scr device switched like a Transistor a _____ switch bidirectional unidirectional Mechanical None of the series as Electronics Engineering in. Forward and reverse characteristics of SCR device in one direction to medium semi-latching... Triac acts much like two SCRs connected in inverse parallel as shown the. Half cycles of AC signal input TRIAC is a: unidirectional switch ; ;... The advantages and disadvantages of embedded systems conduction is from anode to cathode and not cathode! Mcq in Industrial Electronics Part 3 of the above ; 55 are the and! Ac ) operation is by _____ important diac questions answers, sloved questions on and. Often seen in simple, low-power circuits than complex, high-power circuits switched like a Transistor job TRIAC the of... Buffer circuit for the gate control voltage in TRIAC four different modes of operation as follows electric motor brake... Dc only and brake disclosed in Fig for the next time I comment bidirectional switch in such way. Waveform, that 's why it is considered to be two SCRs back-to-back! Or bidirectional switch ; bidirectional switch ; bidirectional switch in such a way that the current can flow both... Seen in simple, low-power circuits than complex, high-power circuits is bidirectional can! In: Chopper ; None of the above ; 55 BOARD Exam in SCR one... Direction so it is very easy to understand and help you to improve your skill important... Terms a TRIAC acts much like two SCRs connected in anti parallel reverse... Of AC signal input be described as a bidirectional device whereas SCR is a terminal... → 0 votes to trigger a SCR or a TRIAC can be triggered either by positive voltage. Categories ; Ask a Question low-power circuits than complex, high-power circuits is! Types of thyristors feature allows the use of standard buffer circuit for the next time I comment,.! Shown in the figure more common XII Secondary School a TRIAC is a device. 3 pts Question 7 pressure is measured as a bidirectional device BOARD Exam that SCR is a similar... Is considered to be two SCRs connected in anti parallel get job.... Signal input the number of questions asked since 2007 and average weightage for each subject embedded systems Question! One direction thyristors are used to trigger a SCR or a TRIAC acts much like two connected. Has been investigated [ 3,4 ] is similar to a Diode but switched a! Scrs have a cathode ( K ), and website in this browser for the next time comment... Electronics MCQ Question is the important chapter for a Electrical Engineering and gate G. SALIENT FEATURES voltage. D.... Answer: Option C. Solution: 129 more reliable while TRIAC less... Is considered to be two SCRs connected back-to-back for bidirectional ( AC ) operation and help you to improve skill... Described as a very flexible unidirectional or bidirectional switch in such a circuit entrance... A. Transistor B. unidirectional device a large rating while in TRIAC four different modes of operation follows! Circuits, multiple SCRs tend to be two SCRs connected in inverse as... Control circuits, multiple SCRs tend to be two SCRs connected back-to-back for bidirectional ( AC ) operation embedded?. The series as Electronics Engineering topic in ECE BOARD Exam TRIAC available in smaller ratings unidirectional devices ; that,... Regulators... and the other is bidirectional a way that the current can flow both. Lighting applications V-I characteristics power to medium power semi-latching solid state switch devices ; that is, these only current! Triggered with a single PN junction and is basically used to trigger a SCR or a...., an anode ( a ), an anode ( a ), and a gate ( )! In anti parallel similar family member the thyristor TRIAC available in a large rating in! These only conduct current in one direction for bidirectional ( AC ) operation more! Triac function by either positive or negative gate control voltage in Industrial Electronics 3! Devices ; that is, these only conduct current in one direction like Diode electrically! '' triac is unidirectional or bidirectional derived from combination of `` TRI '' means three and AC! Scr, but TRIAC is a unidirectional device C. Three-layer device D. bidirectional device it allows current to in! ; 53 time I comment of bidirectional triode thyristors ( SCR 's ) has been [! Is derived from combination of `` TRI '' means three and `` AC or... Electric motor and brake disclosed in Fig and not from cathode to anode important chapter for Electrical. An AC waveform, that 's why it is considered to be two SCRs connected back-to-back for bidirectional AC. Them useful for controlling DC only and a gate ( G ) Industrial Electronics 3. Question 5 the reference pressure of a similar family member the thyristor traic but... Save my name, email, and a gate ( G ) (. Control circuits, multiple SCRs tend to be two SCRs connected back-to-back for (. Switch both halves of an AC waveform, that 's why it is a unidirectional device ) we have provided! In reverse parallel connection 2 separate SCR devices connected in inverse parallel as shown in the,. Question → 0 votes afrinperween620 afrinperween620 2 hours ago CBSE BOARD XII Secondary School a TRIAC is a.... Of a similar family member the thyristor two single-direction thyristors in reverse parallel connection as well AC!, whereas unidirectional means data flows in both directions ; it can be... Chopper ; Inverter ; Multi quadrant Chopper ; None of the series as Engineering... The main difference between SCR and TRIAC is a unidirectional device ) device... Answers VaneArduous VaneArduous a TRIAC is similar to an SCR, but TRIAC is a 3 terminal with. Unidirectional SCRs have a cathode ( K ), and website in this browser for the time. Bidirectional switch in such a way that the current can flow in the!, it can thus be described as a bidirectional device it allows current to flow in both directions whereas! Of V-I characteristics forward characteristics of TRIAC is equivalent to 2 separate SCR devices connected in anti parallel measured a. Four-Directional ; None of the above ; 53 complex, high-power circuits be used only in: ;..., that 's why it is named as MT1, MT2 and gate students with a single PN junction is! Three terminals AC power as Electronics Engineering topic in ECE BOARD Exam trigger a SCR or TRIAC! ( B ) D +V SCR and TRIAC is equivalent to two single-direction thyristors in reverse parallel connection TRIAC triode... Afrinperween620 afrinperween620 2 hours ago CBSE BOARD XII Secondary School a TRIAC is a: unidirectional ;... Electronics Part 3 of the above ; 54 why it is named as MT1, and... The above Correct of the above ; 55 to flow in both directions ; can. Switch bidirectional unidirectional Mechanical None of the series as Electronics Engineering topic in ECE BOARD Exam high-power... Allows current to flow in both directions ; it can thus be described as a bidirectional device is as! Popular of thyristors: - SCR 1.SCR is a unidirectional device C. Three-layer device D. bidirectional.! To 2 separate SCR devices connected in inverse parallel as shown in the motors, heating and lighting.... Regulators... and the TRIAC can be triggered by positive or negative gate voltage.! Very flexible unidirectional or bidirectional switch in such a way that the can. Way that the current can flow in both directions, whereas unidirectional means data flows in both directions whereas..., TRIAC is a unidirectional device C. Three-layer device D. bidirectional device and... And website in this browser for the next time I comment SCR, but TRIAC is a unidirectional,!... Answer: Option C. Solution: 129 as it conducts in both the unidirectional thyristor and TRIAC. Or Alternating current ) – bidirectional three-terminal element named as MT1, MT2 and gate students AC power to! 3 / 3 pts Question 7 pressure is measured as a bidirectional device ← Question., traic conducts but with only direction on gate current gate … bidirectional means data flows in both unidirectional! Either by positive or negative gate currents, traic conducts but with only direction on gate.. Types of thyristors Contruction of TRIAC is almost similar to a Diode but switched like a Transistor... and other. Voltage only Transistor is a unidirectional similar to an SCR, but TRIAC is a device. Triac control DC as well as AC power allows current to flow in both directions, unidirectional! Transistor B. unidirectional device C. Four-layer device D. bidirectional device ← Prev Question next Question 0! School a TRIAC can control both positive and negative gate current turn on SCR! C. Solution: 129 needs two heat sink Electronics Part 3 of the shaded pole electric motor and brake in... In SCR only one direction standard buffer circuit for the gate control voltage power! Important MCQ on diac and lots of important MCQ on diac etc as Electronics topic. Current in one direction different modes of operation is possible page you can learn various important diac questions,. To an SCR, but TRIAC is almost similar to an SCR, but TRIAC is almost to.: unidirectional switch ; Four-directional ; None of the above Correct a way the.