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Questions and Answers
What is the primary purpose of a diac in a triac-based circuit?
What is the primary purpose of a diac in a triac-based circuit?
- To provide a stable reference voltage for the triac
- To act as a voltage regulator for the triac
- To trigger the triac into conduction (correct)
- To protect the triac from reverse biasing
Which of the following is NOT a common application of a diac?
Which of the following is NOT a common application of a diac?
- Light dimming
- Heat control
- Universal motor speed control
- Voltage regulation (correct)
In a diac-triac based lamp dimmer circuit, what is the purpose of the series $R_4$-$C_1$ circuit across the triac?
In a diac-triac based lamp dimmer circuit, what is the purpose of the series $R_4$-$C_1$ circuit across the triac?
- To limit the rate of voltage rise across the triac during switch off (correct)
- To filter out noise in the input voltage
- To provide a stable reference voltage for the diac
- To adjust the phase of the voltage across the triac
What is the purpose of using a diac to trigger a triac in a circuit?
What is the purpose of using a diac to trigger a triac in a circuit?
What is the relationship between the breakover voltage and holding current of a diac?
What is the relationship between the breakover voltage and holding current of a diac?
Which of the following is a key advantage of using a diac to trigger a triac in a circuit?
Which of the following is a key advantage of using a diac to trigger a triac in a circuit?
What is the key characteristic of an SCR that allows it to control the flow of AC power?
What is the key characteristic of an SCR that allows it to control the flow of AC power?
How can the phase angle of the gate voltage in an SCR circuit be adjusted?
How can the phase angle of the gate voltage in an SCR circuit be adjusted?
What is the primary advantage of using a triac to control AC power, compared to an SCR?
What is the primary advantage of using a triac to control AC power, compared to an SCR?
Which of the following is NOT a common application of a triac?
Which of the following is NOT a common application of a triac?
In the triac circuit shown in Fig. 21.11, what happens when the switch S is thrown to position 1?
In the triac circuit shown in Fig. 21.11, what happens when the switch S is thrown to position 1?
What is the primary reason triacs are often used as electronic on/off switches controlled by mechanical switches?
What is the primary reason triacs are often used as electronic on/off switches controlled by mechanical switches?
What is the primary advantage of using semiconductor switching devices over electrical methods for controlling power flow?
What is the primary advantage of using semiconductor switching devices over electrical methods for controlling power flow?
Which of the following semiconductor switching devices can control alternating current in a load?
Which of the following semiconductor switching devices can control alternating current in a load?
What is the primary limitation of a silicon controlled rectifier (SCR) that necessitates the use of a triac?
What is the primary limitation of a silicon controlled rectifier (SCR) that necessitates the use of a triac?
Which of the following semiconductor switching devices is used for controlled rectification, inversion, and regulation of power in a load?
Which of the following semiconductor switching devices is used for controlled rectification, inversion, and regulation of power in a load?
What is the primary purpose of using semiconductor switching devices in power control applications?
What is the primary purpose of using semiconductor switching devices in power control applications?
Which of the following statements is true about triacs?
Which of the following statements is true about triacs?
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