Dredging Corporation of India Interview Questions and Answers

Tests to be conducted before charging of Power transformer

• Insulation resistance test

• Polarity and phase-relation test

• Turns ratio test

• Vector group test

• Oil test

• Functional test

Scheduled maintenance programs for TSS and PSS

• TSS (Total Suspended Solids) requires regular cleaning of filters and monitoring of chemical levels

• PSS (Particulate Suspended Solids) requires regular cleaning of filters and monitoring of pressure levels

• Both TSS and PSS require regular calibration of instruments and replacement of worn out parts

• Maintenance schedules may vary depending on the specific equipment and usage

• Reg...read more

Charging current of transmission line varies based on the conditions - OH or UG.

• Charging current is the current that flows through the capacitance of the transmission line.

• In OH conditions, the charging current is higher due to the larger distance between the conductors and the ground.

• In UG conditions, the charging current is lower due to the smaller distance between the conductors and the ground.

• The charging current a...read more

Use advanced earthing techniques and equipment to accurately measure earth values in rocky areas.

• Use specialized equipment like clamp-on ground resistance testers

• Install additional grounding rods to improve accuracy

• Consider using chemical electrodes for better contact with the ground

• Ensure proper installation and maintenance of earthing system

• Consult with experts in earthing and grounding for best practices

The standard of railway crossings for different voltage lines as per RDSO.

• RDSO specifies different standards for railway crossings based on the voltage of the lines.

• For 33 kV lines, the minimum height of the overhead equipment is 5.5 meters.

• For 11 kV lines, the minimum height of the overhead equipment is 5 meters.

• For 132 kV lines, the minimum height of the overhead equipment is 7 meters.

• For 440 kV lines, the minimum he...read more

Differential potential of transformer is the voltage difference between the primary and secondary windings.

• It is a measure of the transformer's ability to isolate the primary and secondary circuits.

• It is important for safety and proper functioning of the transformer.

• The differential potential is affected by the turns ratio and the insulation between the windings.

• A high differential potential can cause arcing and damage...read more

SOP of RE projects involves defining project scope, identifying stakeholders, creating project plan, executing and monitoring progress.

• Define project scope and objectives

• Identify stakeholders and their requirements

• Create project plan with timelines and milestones

• Execute project plan and monitor progress

• Manage risks and issues

• Ensure quality control and compliance

• Close out project and conduct lessons learned

Implement strict inventory management, conduct regular audits, and train employees on theft prevention and material handling.

• Implement a strict inventory management system to keep track of all materials and equipment.

• Conduct regular audits to identify any discrepancies or missing items.

• Train employees on theft prevention techniques and proper material handling procedures.

• Install security cameras and alarms to deter the...read more

Take appropriate action against contractors not complying with specifications.

• Identify the specific non-compliance issues

• Communicate the non-compliance to the contractors

• Request corrective actions or modifications to meet the specifications

• Monitor and document the progress of corrective actions

• Consider penalties or contract termination if non-compliance persists