Question

Which of the following is the standard electrification system used by Indian railways for mainline trains?

• A. \(1500\ \text{V DC}\)
• B. \(33\ \text{kV AC},\ 50\ \text{Hz}\)
• C. \(25\ \text{kV AC},\ 50\ \text{Hz}\)
• D. \(11\ \text{kV DC}\)

Hint:

Indian mainline railway electrification commonly uses \(25\ \text{kV AC},\ 50\ \text{Hz}\).

Answer 1

The Correct Option is C

Concept: Mainline railway electrification requires an efficient high-voltage supply system to transmit power over long distances.

Step 1: Higher voltage reduces current for the same power.

Step 2: Lower current reduces transmission losses in overhead equipment.

Step 3: Indian Railways uses single phase AC traction supply for mainline trains.

Step 4: The standard system is: \[ 25\ \text{kV AC},\ 50\ \text{Hz} \] Therefore: \[ \boxed{25\ \text{kV AC},\ 50\ \text{Hz}} \]