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Consider the following statements associated with various commutation techniques of a thyristor:
1. In forced commutation, the commutating components L and C carry load current continuously.
2. Forced commutation is usually employed in dc choppers.
3. In load commutation, L and Care connected in parallel with the load or C in series with the load.
4. Load commutation is employed in series inverters.
5. In class-C commutation, the main thyristor that is to be commutated is connected in parallel with the load.
Which of the statements given above are correct?
  • a)
    2 and 4
  • b)
    1,3 and 5
  • c)
    2, 4 and 5
  • d)
    1,2, 3 and 5
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Consider the following statements associated with various commutation ...
  • In forced commutation, the commutating components L and C do not carry load current continuously.
  • Forced commutation is usually employed in dc choppers because natural current zero is not available in the circuits containing dc choppers.
  • In load commutation. L and Care connected in series with the load or C in parallel with the load such that overall load circuit is underdamped.
  • Load commutation is employed in series inverters.
  •  In class-C commutation, the main thyristor that is to be commutated is connected in series with the load while the complementary thyristor is connected in parallel with the main thyristor as shown below.
Thus, statements 2 and 4 are only correct.
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Most Upvoted Answer
Consider the following statements associated with various commutation ...
Explanation:

Forced commutation:
- Forced commutation is a technique used to turn off a thyristor by applying an external voltage or current to it.
- In forced commutation, the commutating components L (inductor) and C (capacitor) carry load current continuously.
- The energy stored in the inductor and capacitor is used to commutate or turn off the thyristor.
- Forced commutation is usually employed in DC choppers, where the thyristor is turned off by applying a reverse voltage across it.

Load commutation:
- Load commutation is a technique used to turn off a thyristor by using the load current itself to commutate the device.
- In load commutation, the commutating components L and C are connected in parallel with the load or C is connected in series with the load.
- Load commutation is employed in series inverters, where the thyristors are turned off by the natural commutation of the load current.

Class-C commutation:
- Class-C commutation is a technique used to improve the commutation of a thyristor by connecting a parallel thyristor in parallel with the load.
- This additional thyristor helps in diverting the current away from the main thyristor during turn-off, improving its commutation characteristics.

Correct statements:
- From the given statements, the correct statements are:
1. Forced commutation is usually employed in DC choppers.
2. Load commutation is employed in series inverters.

Incorrect statements:
- The incorrect statements are:
1. In forced commutation, the commutating components L and C carry load current continuously. (This is incorrect, as the commutating components carry only the commutation current, not the load current.)
2. In load commutation, L and C are connected in parallel with the load or C is in series with the load. (This is incorrect, as L and C can be connected in different configurations depending on the application.)
3. In class-C commutation, the main thyristor that is to be commutated is connected in parallel with the load. (This is incorrect, as the additional thyristor is connected in parallel with the load, not the main thyristor.)

Therefore, the correct answer is option 'A' - 2 and 4.
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Consider the following statements associated with various commutation techniques of a thyristor:1. In forced commutation, the commutating components L and C carry load current continuously.2. Forced commutation is usually employed in dc choppers.3. In load commutation, L and Care connected in parallel with the load or C in series with the load.4. Load commutation is employed in series inverters.5. In class-C commutation, the main thyristor that is to be commutated is connected in parallel with the load.Which of the statements given above are correct?a)2 and 4b)1,3 and 5c)2, 4 and 5d)1,2, 3 and 5Correct answer is option 'A'. Can you explain this answer?
Question Description
Consider the following statements associated with various commutation techniques of a thyristor:1. In forced commutation, the commutating components L and C carry load current continuously.2. Forced commutation is usually employed in dc choppers.3. In load commutation, L and Care connected in parallel with the load or C in series with the load.4. Load commutation is employed in series inverters.5. In class-C commutation, the main thyristor that is to be commutated is connected in parallel with the load.Which of the statements given above are correct?a)2 and 4b)1,3 and 5c)2, 4 and 5d)1,2, 3 and 5Correct answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Consider the following statements associated with various commutation techniques of a thyristor:1. In forced commutation, the commutating components L and C carry load current continuously.2. Forced commutation is usually employed in dc choppers.3. In load commutation, L and Care connected in parallel with the load or C in series with the load.4. Load commutation is employed in series inverters.5. In class-C commutation, the main thyristor that is to be commutated is connected in parallel with the load.Which of the statements given above are correct?a)2 and 4b)1,3 and 5c)2, 4 and 5d)1,2, 3 and 5Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements associated with various commutation techniques of a thyristor:1. In forced commutation, the commutating components L and C carry load current continuously.2. Forced commutation is usually employed in dc choppers.3. In load commutation, L and Care connected in parallel with the load or C in series with the load.4. Load commutation is employed in series inverters.5. In class-C commutation, the main thyristor that is to be commutated is connected in parallel with the load.Which of the statements given above are correct?a)2 and 4b)1,3 and 5c)2, 4 and 5d)1,2, 3 and 5Correct answer is option 'A'. Can you explain this answer?.
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