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SarkariResultOutBMS · 2024

Previous Year Question

The rate of rise of restriking voltage (RRRV) is dependent on
  1. The resistance of the system only
  2. The inductance of the system only
  3. The capacitance of the system only
  4. The inductance and capacitance of the system

Correct answer: D

Explanation

After current interruption, energy exchange between system inductance and capacitance determines the transient restriking/recovery voltage. Consequently the rate of rise depends on both L and C, approximately through the natural frequency 1/√(LC). Hence option D.

Formula

ωn≈1/√(LC); RRRV is governed by the system L-C transient

Step-by-step solution

RRRV Dependence explanatory diagram

Correct Answer

D — The inductance and capacitance of the system

Concept and Reasoning

After current interruption, energy exchange between system inductance and capacitance determines the transient restriking/recovery voltage. Consequently the rate of rise depends on both L and C, approximately through the natural frequency 1/√(LC). Hence option D.

Calculation / Key Relation

ωn≈1/√(LC)

RRRV is governed by the system L-C transient

Exam Takeaway

RRRV is an LC transient phenomenon.

Common Mistake

Do not attribute RRRV to only inductance or only capacitance.

Common mistake

Do not attribute RRRV to only inductance or only capacitance.

Exam tip

RRRV is an LC transient phenomenon.

Quick method

RRRV is an LC transient phenomenon.