Choose the INCORRECT statement with respect to the DC system for railway.

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SSC JE EE Previous Paper 12 (Held on: 24 March 2021 Evening)
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  1. When operating under similar service conditions. a DC train consumes less energy than a one-phase AC train
  2. DC system causes low electrical interference with overhead communication lines.
  3. DC motors are better suited for frequent and rapid acceleration of heavy trains than AC motors.
  4. DC train equipment is heavier and less efficient than similar AC equipment.

Answer (Detailed Solution Below)

Option 4 : DC train equipment is heavier and less efficient than similar AC equipment.
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Detailed Solution

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Railway Electrification System:

A railway electrification system supplies electric power to railway trains and trams without an on-board prime mover or local fuel supply.

Classification:

Here we consider based on the supply given

  • Direct current (DC).
  • Alternating current (AC).
  • Composite system (Both AC and DC).

Advantages of DC Electrification System:

The choice of selecting a DC electrification system encompasses many advantages, such as

  • Space and weight considerations and braking of DC electric motors.
  • In this type of system, three-phase power received from the power grids is de-escalated to low voltage and converted into DC by the rectifiers and power-electronic converters.
  • In the case of heavy trains that require frequent and rapid accelerations, DC traction motors are a better choice as compared to AC motors.
  • DC train consumes less energy compared to AC unit for operating same service conditions.
  • The equipment in the DC traction system is less costly, lighter, and more efficient than the AC traction system.
  • It causes no electrical interference with nearby communication lines.
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