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SarkariResultOutAdditional Assistant Engineer (Electrical) · 2026

Previous Year Question

During circuit interruption, what does the term arc voltage refer to?
  1. The voltage induced in the secondary winding of a CT
  2. The voltage appearing across contacts while the arc is maintained
  3. The voltage remaining across contacts after current zero
  4. The voltage present across the load during steady operation

Correct answer: B

Explanation

Arc voltage is the voltage drop across the circuit-breaker contacts while an arc is actually present between them. It exists during the arcing interval and is distinct from recovery or restriking voltage.

Step-by-step solution

Arc Voltage explanatory diagram

Correct Answer

B — The voltage appearing across contacts while the arc is maintained

Explanation

Arc voltage is the voltage drop across the circuit-breaker contacts while an arc is actually present between them. It exists during the arcing interval and is distinct from recovery or restriking voltage.

Key Concept

Arc Voltage

Exam Point

Arc present → arc voltage; arc extinguished → recovery/restriking concepts.

Exam tip

Arc present → arc voltage; arc extinguished → recovery/restriking concepts.

Quick method

Arc present → arc voltage; arc extinguished → recovery/restriking concepts.