Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > As the firing of a thyristor is delayed, the ...
Start Learning for Free
As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.
- a)True
- b)False
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
As the firing of a thyristor is delayed, the output voltage of a contr...
Introduction:
In a controlled rectifier, thyristors are used to control the flow of current in the rectifier circuit. The firing of a thyristor refers to the moment when it is triggered to conduct current. The firing delay refers to the time interval between the triggering signal and the actual firing of the thyristor.
Explanation:
When the firing of a thyristor is delayed in a controlled rectifier, it has an impact on the output voltage of the rectifier. The output voltage is dependent on the conduction angle, which is the duration during which the thyristors are conducting current.
Decrease in Output Voltage:
When the firing of a thyristor is delayed, the conduction angle decreases. This means that the thyristors conduct current for a shorter duration during each cycle of the input AC waveform. As a result, the average value of the output voltage decreases.
Reason:
The output voltage of a controlled rectifier is obtained by converting the AC input voltage into a DC voltage. The output voltage is directly proportional to the conduction angle. When the conduction angle decreases due to the firing delay, the average value of the output voltage also decreases.
Effect on Waveform:
As the firing of a thyristor is delayed, the waveform of the output voltage becomes more distorted. The output voltage waveform will have a higher ripple content and a lower average value.
Impact on Load:
The decrease in output voltage due to the firing delay can affect the performance of the load connected to the rectifier. If the load requires a specific voltage level for proper operation, the decrease in output voltage may result in malfunctioning or improper functioning of the load.
Conclusion:
In a controlled rectifier, the firing delay of thyristors has a significant impact on the output voltage. As the firing is delayed, the conduction angle decreases, resulting in a decrease in the average value of the output voltage. It is important to consider the firing timing and control in order to maintain the desired output voltage level and ensure proper operation of the load.
In a controlled rectifier, thyristors are used to control the flow of current in the rectifier circuit. The firing of a thyristor refers to the moment when it is triggered to conduct current. The firing delay refers to the time interval between the triggering signal and the actual firing of the thyristor.
Explanation:
When the firing of a thyristor is delayed in a controlled rectifier, it has an impact on the output voltage of the rectifier. The output voltage is dependent on the conduction angle, which is the duration during which the thyristors are conducting current.
Decrease in Output Voltage:
When the firing of a thyristor is delayed, the conduction angle decreases. This means that the thyristors conduct current for a shorter duration during each cycle of the input AC waveform. As a result, the average value of the output voltage decreases.
Reason:
The output voltage of a controlled rectifier is obtained by converting the AC input voltage into a DC voltage. The output voltage is directly proportional to the conduction angle. When the conduction angle decreases due to the firing delay, the average value of the output voltage also decreases.
Effect on Waveform:
As the firing of a thyristor is delayed, the waveform of the output voltage becomes more distorted. The output voltage waveform will have a higher ripple content and a lower average value.
Impact on Load:
The decrease in output voltage due to the firing delay can affect the performance of the load connected to the rectifier. If the load requires a specific voltage level for proper operation, the decrease in output voltage may result in malfunctioning or improper functioning of the load.
Conclusion:
In a controlled rectifier, the firing delay of thyristors has a significant impact on the output voltage. As the firing is delayed, the conduction angle decreases, resulting in a decrease in the average value of the output voltage. It is important to consider the firing timing and control in order to maintain the desired output voltage level and ensure proper operation of the load.
Free Test
FREE
| Start Free Test |
Community Answer
As the firing of a thyristor is delayed, the output voltage of a contr...
The effect of delayed firing of a thyristor on the output voltage of a controlled rectifier:
There are two types of controlled rectifiers: half-wave and full-wave. Both types use thyristors as the main switching devices.
1. Half-wave controlled rectifier:
In a half-wave controlled rectifier, a single thyristor is used to control the flow of current from the AC source to the load. The thyristor is triggered at a specific angle of the AC waveform, which determines the portion of the waveform that is rectified.
When the firing of the thyristor is delayed, the angle at which it is triggered is shifted towards the end of the AC waveform cycle. This means that the thyristor conducts for a shorter period of time, resulting in a smaller portion of the waveform being rectified. As a result, the average output voltage of the rectifier decreases.
2. Full-wave controlled rectifier:
In a full-wave controlled rectifier, two thyristors are used to control the flow of current in both the positive and negative half-cycles of the AC waveform. The firing angles of both thyristors determine the portion of the waveform that is rectified.
When the firing of both thyristors is delayed, the angles at which they are triggered are shifted towards the end of their respective half-cycles. This means that both thyristors conduct for a shorter period of time, resulting in a smaller portion of the waveform being rectified. As a result, the average output voltage of the rectifier decreases.
Conclusion:
In both half-wave and full-wave controlled rectifiers, delaying the firing of the thyristors reduces the conduction angle and the portion of the AC waveform that is rectified. This leads to a decrease in the average output voltage of the rectifier. Therefore, the statement that "the output voltage of a controlled rectifier decreases when the firing of a thyristor is delayed" is true.
There are two types of controlled rectifiers: half-wave and full-wave. Both types use thyristors as the main switching devices.
1. Half-wave controlled rectifier:
In a half-wave controlled rectifier, a single thyristor is used to control the flow of current from the AC source to the load. The thyristor is triggered at a specific angle of the AC waveform, which determines the portion of the waveform that is rectified.
When the firing of the thyristor is delayed, the angle at which it is triggered is shifted towards the end of the AC waveform cycle. This means that the thyristor conducts for a shorter period of time, resulting in a smaller portion of the waveform being rectified. As a result, the average output voltage of the rectifier decreases.
2. Full-wave controlled rectifier:
In a full-wave controlled rectifier, two thyristors are used to control the flow of current in both the positive and negative half-cycles of the AC waveform. The firing angles of both thyristors determine the portion of the waveform that is rectified.
When the firing of both thyristors is delayed, the angles at which they are triggered are shifted towards the end of their respective half-cycles. This means that both thyristors conduct for a shorter period of time, resulting in a smaller portion of the waveform being rectified. As a result, the average output voltage of the rectifier decreases.
Conclusion:
In both half-wave and full-wave controlled rectifiers, delaying the firing of the thyristors reduces the conduction angle and the portion of the AC waveform that is rectified. This leads to a decrease in the average output voltage of the rectifier. Therefore, the statement that "the output voltage of a controlled rectifier decreases when the firing of a thyristor is delayed" is true.
|
Explore Courses for Electrical Engineering (EE) exam
|
|
Top Courses for Electrical Engineering (EE)View all
Question Description
As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.a)Trueb)FalseCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.a)Trueb)FalseCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.a)Trueb)FalseCorrect answer is option 'A'. Can you explain this answer?.
As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.a)Trueb)FalseCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.a)Trueb)FalseCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.a)Trueb)FalseCorrect answer is option 'A'. Can you explain this answer?.
Solutions for As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.a)Trueb)FalseCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electrical Engineering (EE).
Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free.
Here you can find the meaning of As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.a)Trueb)FalseCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.a)Trueb)FalseCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.a)Trueb)FalseCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.a)Trueb)FalseCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.a)Trueb)FalseCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Electrical Engineering (EE) tests.
|
|
Explore Courses for Electrical Engineering (EE) exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup