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Assertion (A) : If the one-state anode current drops below a minimum level, designated as the holding current IH, the thyristor reverts to the forward blocking state.
Reason (R) : The loop gain of the equivalent pnp-npn transistors fall below unity and the regenerative hold-on action ceases.
Reason (R) : The loop gain of the equivalent pnp-npn transistors fall below unity and the regenerative hold-on action ceases.
- a)Both A and R are true and R is the correct explanation of A.
- b)Both A and R are true but R is not the correct explanation of A.
- c)A is true but R is false.
- d)A is false but R is true.
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Assertion (A) : If the one-state anode current drops below a minimum l...
For successful turn ON i1 + i2 ≥ 100 mA
I = i1 + i2 = (8 + 7.9) (1 - e-20t ) = 100 mA
1 – e-20t = 6.30μ
t = 3.15 × 10-4 s
I = i1 + i2 = (8 + 7.9) (1 - e-20t ) = 100 mA
1 – e-20t = 6.30μ
t = 3.15 × 10-4 s
Most Upvoted Answer
Assertion (A) : If the one-state anode current drops below a minimum l...
Explanation:
The given assertion and reason both are true and the reason explains the assertion correctly. Let's understand each statement in detail.
Assertion (A) : If the one-state anode current drops below a minimum level, designated as the holding current IH, the thyristor reverts to the forward blocking state.
Explanation:
The thyristor is a four-layer, three-junction semiconductor device that acts as a switch. The thyristor has three states of operation: forward-blocking state, forward-conducting state, and reverse-blocking state. When the thyristor is forward-biased, it starts conducting when the anode voltage exceeds the cathode voltage. The thyristor remains in the forward-conducting state even after the anode current is reduced to a low value. The thyristor remains in this state until the anode-cathode voltage is reduced to zero.
But, if the anode current drops below a minimum level, designated as the holding current IH, the thyristor reverts to the forward blocking state. The holding current IH is the minimum current required to keep the thyristor in the forward-conducting state. If the anode current falls below this level, the thyristor turns off and goes back to the forward-blocking state.
Reason (R) : The loop gain of the equivalent pnp-npn transistors fall below unity and the regenerative hold-on action ceases.
Explanation:
The thyristor can be represented as two transistors connected in a regenerative feedback loop. The first transistor is an npn transistor, and the second transistor is a pnp transistor. When the thyristor is forward-biased, the npn transistor turns on, which, in turn, turns on the pnp transistor. This regenerative feedback loop causes the thyristor to remain in the forward-conducting state even after the anode current is reduced to a low value.
But, if the anode current drops below the holding current IH, the loop gain of the equivalent pnp-npn transistors falls below unity, and the regenerative hold-on action ceases. The regenerative feedback loop cannot sustain itself at this low level of current, and the thyristor turns off and goes back to the forward-blocking state.
Conclusion:
From the above explanation, it is clear that both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A). Therefore, the correct answer is option A.
The given assertion and reason both are true and the reason explains the assertion correctly. Let's understand each statement in detail.
Assertion (A) : If the one-state anode current drops below a minimum level, designated as the holding current IH, the thyristor reverts to the forward blocking state.
Explanation:
The thyristor is a four-layer, three-junction semiconductor device that acts as a switch. The thyristor has three states of operation: forward-blocking state, forward-conducting state, and reverse-blocking state. When the thyristor is forward-biased, it starts conducting when the anode voltage exceeds the cathode voltage. The thyristor remains in the forward-conducting state even after the anode current is reduced to a low value. The thyristor remains in this state until the anode-cathode voltage is reduced to zero.
But, if the anode current drops below a minimum level, designated as the holding current IH, the thyristor reverts to the forward blocking state. The holding current IH is the minimum current required to keep the thyristor in the forward-conducting state. If the anode current falls below this level, the thyristor turns off and goes back to the forward-blocking state.
Reason (R) : The loop gain of the equivalent pnp-npn transistors fall below unity and the regenerative hold-on action ceases.
Explanation:
The thyristor can be represented as two transistors connected in a regenerative feedback loop. The first transistor is an npn transistor, and the second transistor is a pnp transistor. When the thyristor is forward-biased, the npn transistor turns on, which, in turn, turns on the pnp transistor. This regenerative feedback loop causes the thyristor to remain in the forward-conducting state even after the anode current is reduced to a low value.
But, if the anode current drops below the holding current IH, the loop gain of the equivalent pnp-npn transistors falls below unity, and the regenerative hold-on action ceases. The regenerative feedback loop cannot sustain itself at this low level of current, and the thyristor turns off and goes back to the forward-blocking state.
Conclusion:
From the above explanation, it is clear that both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A). Therefore, the correct answer is option A.
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Assertion (A) : If the one-state anode current drops below a minimum level, designated as the holding current IH, the thyristor reverts to the forward blocking state.Reason (R) : The loop gain of the equivalent pnp-npn transistors fall below unity and the regenerative hold-on action ceases.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)A is false but R is true.Correct answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2026 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Assertion (A) : If the one-state anode current drops below a minimum level, designated as the holding current IH, the thyristor reverts to the forward blocking state.Reason (R) : The loop gain of the equivalent pnp-npn transistors fall below unity and the regenerative hold-on action ceases.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)A is false but R is true.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion (A) : If the one-state anode current drops below a minimum level, designated as the holding current IH, the thyristor reverts to the forward blocking state.Reason (R) : The loop gain of the equivalent pnp-npn transistors fall below unity and the regenerative hold-on action ceases.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)A is false but R is true.Correct answer is option 'A'. Can you explain this answer?.
Assertion (A) : If the one-state anode current drops below a minimum level, designated as the holding current IH, the thyristor reverts to the forward blocking state.Reason (R) : The loop gain of the equivalent pnp-npn transistors fall below unity and the regenerative hold-on action ceases.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)A is false but R is true.Correct answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2026 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Assertion (A) : If the one-state anode current drops below a minimum level, designated as the holding current IH, the thyristor reverts to the forward blocking state.Reason (R) : The loop gain of the equivalent pnp-npn transistors fall below unity and the regenerative hold-on action ceases.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)A is false but R is true.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion (A) : If the one-state anode current drops below a minimum level, designated as the holding current IH, the thyristor reverts to the forward blocking state.Reason (R) : The loop gain of the equivalent pnp-npn transistors fall below unity and the regenerative hold-on action ceases.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)A is false but R is true.Correct answer is option 'A'. Can you explain this answer?.
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