REC Power Development and Consultancy Electrical Engineer Interview Questions and Answers

Work process, Work planing etc.

Full Power Sub-Station work, Feeder Segregation, Feeder Bifurcation, LT AB Cable Replacement, Recunductring of old HT 11kv lines under Revamped distribution scheme.

Q1. HT/LT Line diffrence ?
Ans. 
HT lines are high tension lines used for transmitting electricity over long distances at high voltages, while LT lines are low tension lines used for distributing electricity at lower voltages in local areas.
• HT lines carry electricity at high voltages for long distance transmission.

• LT lines distribute electricity at lower voltages in local areas.

• HT lines are typically used for transmission towers, while LT lines are us...read more
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Q2. What equipment required in HT and LT Lines ?
Ans. 
Equipment required in HT and LT lines include transformers, circuit breakers, insulators, conductors, and lightning arresters.
• Transformers are used to step up or step down voltage levels in HT and LT lines.

• Circuit breakers are essential for protecting the lines from overloads and short circuits.

• Insulators are used to support and separate conductors to prevent electrical leakage.

• Conductors are used to carry the electric...read more
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Q3. Types of GI Top Channels, Cross angles, Types of DTR, Ratting of DTR, Current capacity of DTR's ?
Ans. 
Types of GI top channels, cross angles, types of DTR, rating of DTR, current capacity of DTRs.
• Types of GI top channels include GI plain channels and GI perforated channels.

• Cross angles are used to provide additional support and stability to structures.

• Types of DTR (Distribution Transformer Rectifier) include single-phase and three-phase.

• Rating of DTR is typically in kVA (kilo Volt-Ampere) and can range from 25 kVA to 2...read more
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Q4. DTR Structure materials ?
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Q5. Required Earthing in DTR Structures ?
Ans. 
Earthing in DTR structures is essential for safety and proper functioning of the equipment.
• Earthing helps in dissipating fault currents safely to the ground.

• It provides protection against electric shocks and equipment damage.

• Proper earthing reduces the risk of fire hazards.

• Earthing should be done using copper rods or strips buried in the ground.

• Regular maintenance and testing of earthing systems is necessary.
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Q6. What is the use of Earthing road, use process of Earthing road in HT Lines ?
Ans. 
Earthing road is used in HT lines to provide a path for fault current to flow safely into the ground, preventing damage to equipment and ensuring safety.
• Earthing road is a conductive strip or wire buried in the ground near HT lines.

• It provides a low resistance path for fault current to flow into the ground, preventing damage to equipment and ensuring safety.

• Proper installation of earthing road involves burying the cond...read more
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Q7. What is the VCB ?
Ans. 
VCB stands for Vacuum Circuit Breaker, a type of circuit breaker that uses vacuum as the arc quenching medium.
• VCB is a type of circuit breaker that uses vacuum as the arc quenching medium

• It is used to interrupt fault currents in electrical systems

• VCBs are commonly used in medium voltage applications

• They are more reliable and require less maintenance compared to other types of circuit breakers
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Q8. What is the incommer machine ?
Ans. 
The incommer machine is a device used to control the incoming power supply to a system or equipment.
• An incommer machine is typically used in electrical distribution systems to manage the flow of electricity.

• It can be a switchgear device that allows for the connection or disconnection of power sources.

• Incommer machines are essential for ensuring the safety and efficiency of electrical systems.

• Examples include circuit br...read more
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Q9. LT AB Cable's current capacity ?
Ans. 
LT AB Cable's current capacity depends on factors like conductor size, insulation material, ambient temperature, etc.
• Current capacity of LT AB Cable is determined by factors like conductor size, insulation material, ambient temperature, installation method, etc.

• The current capacity can be calculated using standard formulas and tables provided by manufacturers or industry standards.

• For example, a 25mm² LT AB Cable may h...read more
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Q10. What is magger, use of Magger machine ?
Ans. 
A magger is a device used to measure the insulation resistance of electrical equipment or cables.
• Magger machine is also known as insulation tester.

• It is used to check the insulation resistance of electrical systems to ensure safety and prevent electrical failures.

• The machine applies a high voltage to the equipment and measures the resistance to current flow, indicating the condition of the insulation.

• Regular testing wi...read more
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Q11. What is the process of material Inspection of electrical projects.
Ans. 
Material inspection of electrical projects involves checking the quality and specifications of materials used in the project.
• Verify that materials meet project specifications and standards

• Inspect materials for damage or defects

• Check for proper labeling and documentation

• Ensure materials are stored and handled correctly

• Perform tests or measurements on materials as needed

• Examples: checking the gauge and insulation of elec...read more
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Q12. What is the BOQ ?
Ans. 
BOQ stands for Bill of Quantities, a document used in construction projects to list the materials, parts, and labor needed for a project.
• BOQ is a detailed list of items, with quantities and prices, required for a construction project.

• It helps in estimating the total cost of the project and serves as a basis for tendering and budgeting.

• BOQ is typically prepared by quantity surveyors or estimators based on the project dr...read more
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Q13. What is the Handing over taking over certificate ?
Ans. 
Handing over taking over certificate is a document used in engineering projects to officially transfer responsibility from one party to another.
• It is a formal document that signifies the transfer of responsibility from one party to another in engineering projects.

• It includes details such as the scope of work, completion status, quality standards, and any outstanding issues.

• The certificate is signed by both parties to a...read more
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Q14. What is the Single line diagram ?
Ans. 
A single line diagram is a simplified diagram that shows the electrical connections and components of a power system using single lines.
• It is a simplified representation of a power system, showing the main components and their interconnections using single lines.

• It is used by electrical engineers to understand and analyze the power system without getting into the details of each individual component.

• It typically includ...read more
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Q15. What is the Pole schedule ?
Ans. 
A pole schedule is a document that lists the locations and details of all poles used in an electrical distribution system.
• It includes information such as pole number, location, height, material, and any attachments or equipment mounted on the pole.

• Pole schedules are important for maintenance, repair, and expansion of the electrical distribution system.

• Example: Pole 1 located at Main Street, 30 feet tall wooden pole wit...read more
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Q16. What is the process of Feeder bifurcation ?
Ans. 
Feeder bifurcation is the process of dividing a main electrical feeder into multiple branches to distribute power to different areas.
• Feeder bifurcation involves splitting a main feeder into smaller branches to supply power to different sections of a building or facility.

• This process helps in balancing the load and preventing overloading of the main feeder.

• Feeder bifurcation can be done using distribution panels, circui...read more
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Q17. What is the process of Feeder charging and handing over ?
Ans. 
Feeder charging and handing over involves the process of transferring electrical power from one source to another.
• Ensure proper safety measures are in place before starting the process

• Check the voltage and current ratings of the feeder to ensure compatibility with the receiving end

• Disconnect the feeder from the power source and connect it to the receiving end

• Verify the successful transfer of power and ensure proper fun...read more
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Q18. What is the process of Railway crossings ?
Ans. 
Railway crossings are intersections where roads and railway tracks meet, requiring vehicles to stop when trains are passing.
• Railway crossings are equipped with warning signs, lights, and barriers to alert drivers of approaching trains.

• Drivers must stop behind the barriers when they are down and wait for the train to pass before proceeding.

• Some railway crossings also have bells or horns to further warn drivers of an app...read more
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Q19. How many type equipment required in LT and HT line work ?
Ans. 
Various types of equipment are required in LT and HT line work, including transformers, circuit breakers, insulators, conductors, and protective devices.
• Transformers

• Circuit breakers

• Insulators

• Conductors

• Protective devices
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Q20. Step down and step up transformers work.
Ans. 
Step down transformers decrease voltage while step up transformers increase voltage.
• Step down transformers have more turns in the primary coil than the secondary coil.

• Step up transformers have more turns in the secondary coil than the primary coil.

• Step down transformers are used to reduce voltage for household appliances.

• Step up transformers are used in power transmission to increase voltage for long distance transmiss...read more
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