Qdigi Services Service Engineer Interview Questions and Answers

Various types of relays are used in the Indian railway signalling system.

• Electromagnetic relays are commonly used in the Indian railway signalling system.

• Track circuit relays are used to detect the presence of trains on the tracks.

• Route relays are used to control the movement of trains on different routes.

• Interlocking relays ensure the safe operation of railway signals and points.

• Time delay relays are used for controll...read more

To detect earth leakage problem in a module, measure the current flowing through the earth wire.

• Measure the current flowing through the earth wire using a clamp meter.

• If the current is above the specified limit, then there is an earth leakage problem.

• Check the wiring and connections for any faults or damages.

• Perform insulation resistance test to confirm the issue.

• If the problem persists, consult with a qualified electr...read more

DC powered modules should be handled with caution and proper safety measures.

• Always turn off the power supply before handling the modules.

• Use appropriate tools and equipment to avoid electrostatic discharge.

• Follow the manufacturer's instructions for installation and maintenance.

• Regularly check for any signs of damage or wear and tear.

• Ensure proper grounding and insulation to prevent electrical hazards.

• Keep the modules ...read more

Railway electronic interlocking system is a safety system that prevents conflicting movements of trains.

• It uses electronic signals to control the movement of trains and ensure safety.

• It prevents two trains from entering the same track section at the same time.

• It also ensures that a train can only enter a track section if the previous section is clear.

• It can be programmed to allow for different types of train movements,...read more