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DIAC Question & Answers

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This article lists 50 DIAC MCQs for engineering students. All the DIAC Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of DIAC.

When power is applied to load it must be regulated. Electrical methods used in controlling fan or motor speed don't provide proper control for the system when power has flowed. An extensive amount of power is wasted in such situations.

In present scenarios, various devices are developed to allow the power flow in control of the larger blocks present in the system. The instrument utilized for such purposes are referred to as Controlled switches and offer control rectification, power inversion, and regulation in loads.

Semiconductor devices that offer to switch are SCR, UJT, TRIACs, and DIACs. Understanding switching devices is more manageable when knowing thyristors. Thyristors can supply half of the power. Two thyristors are combined forms TRIAC.

DIACs are switching and bi-directional devices. A Gate terminal is absent in such devices. Both polarities can switch ON DIACs making it bi-directional. Two Zener diodes are connected to form DIAC and can utilize to trigger TRIACs. Switching lights, Fluorescent lamps, and dimming applications use DIACs.

1). What does DIAC stand for?

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2). Diode conducting after the Breakover voltage is referred to as _____________?

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3). DIAC is a _________________?

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4). How many diodes are depicted in the DIACs symbol?

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5). How many terminals do a DIAC consist of?

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6). ____________ are referred to as Symmetrical Trigger Diodes?

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7). Which of the following voltage in DIAC is based on factors of fabrication?

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8). Breakdown voltage occurred in DIAC leads to ____________?

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9). Decrease in resistance of DIAC leads to decrease in ___________?

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10). DIAC remains in a state of conduction until the flow of current gets dropped to certain values referred to as ______________?

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11). If the current in DIAC is lower than the holding currents switch it to __________________?

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12). DIAC behaves _____________ in both directions?

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13). How many layers does a DIAC have?

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14). Which material does DIAC have on both sides?

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15). What are the terminals of DIAC?

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16). How many junctions does DIAC consist of?

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17). Diodes in DIAC are ______________?

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18). Why is DIAC considered to be Bi-directional?

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19). What material was utilized in the construction of DIAC?

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20). Decrease in voltage leads to an increase in the flow of the current of DIAC referred to as ____________ region?

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21). What happens if the current in DIAC decreased below the Holding current?

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22). Three regions in DIAC are doped in _____________?

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23). How do the characteristics of DIAC resemble?

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24). DIACs are constructed using ______________?

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25). Which layer DIAC is used widely?

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DIAC MCQs for Exams

26). _____________ DIAC have 30 Volts of Breakover voltage?

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27). Five layers of DIAC resemble the combo of _____________?

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28). In what quadrants of the characteristics curve DIAC operates?

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29). ______________ is equal to four layers pair of SCRs?

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30). What is used in Solid-state Triggering?

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31). DIAC operating with a voltage of DC around it behaves like _________________?

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32). What type of element is DIAC?

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33). What kind of switching DIACs offer?

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34). NTE6408 is the example of ______________?

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35). DIACS are ____________?

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DIAC MCQs for Students

36). DIACs are constructed in _________ form?

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37). DIAC can conduct if the voltage applied increases ____________?

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38). High voltages are blocked in ______________?

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39). Why DIAC is referred to as an Uncontrolled Switch?

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40). What used in regulating the power supply provided to loads of AC?

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41). How DIACs can be turned ON or OFF?

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42). Amplification or control is not offered by _______?

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43). SIDAC have __________?

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44). To trigger TRIAC internally, what does a Quadrac consist ?

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45). How DIAC is connected to TRIAC to trigger it?

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46). Transistors without the base referred to as _______________?

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47). Combination of DIAC and TRIAC used in ____________?

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48). Fluorescent lamps with Starter circuits use ___________?

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49). Light dimmers use ____________?

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50). __________ doesn’t have any trigger or gate electrode?

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