10+ Noboru World Interview Questions and Answers

Substations use various equipment for power distribution and control.

• Transformers: Step up or step down voltage levels.

• Circuit breakers: Protect the system from overloads and faults.

• Switchgear: Control and isolate electrical circuits.

• Busbars: Distribute power to different parts of the substation.

• Relays: Monitor and protect the system from abnormalities.

• Capacitors: Improve power factor and voltage stability.

• Disconnect switches: Safely isolate equipment for maintenance.

• Instrume...read more

CTs, PTs, LAs, and Transformers are electrical devices used in power systems for measurement, protection, and voltage transformation.

• CTs (Current Transformers) are used to measure and transform high currents into manageable levels for instruments and relays.

• PTs (Potential Transformers) are used to measure and transform high voltages into low voltages for instruments and relays.

• LAs (Lightning Arresters) are used to protect electrical equipment from lightning strikes and voltag...read more

The rating of copper and aluminium cables depends on their size, insulation, and intended use.

• Copper cables have higher conductivity and are therefore rated higher than aluminium cables of the same size.

• The rating of a cable also depends on its insulation material and thickness.

• Cables used for high voltage transmission have higher ratings than those used for low voltage applications.

• For example, a 10 AWG copper cable may be rated for 30 amps, while a 10 AWG aluminium cable ma...read more

Types of protection on Transformer side line side

• Overcurrent protection

• Differential protection

• Restricted earth fault protection

• Overvoltage protection

• Under voltage protection

Different types of relays are used for protection system such as overcurrent, differential, distance, and directional relays.

• Overcurrent relays are used to protect against overloads and short circuits.

• Differential relays are used to protect transformers and generators from internal faults.

• Distance relays are used to protect transmission lines from faults.

• Directional relays are used to protect against faults in specific directions.

• Other types of relays used for protection incl...read more

Circuit breakers are safety devices that protect electrical circuits from damage caused by overload, short circuit, or ground fault.

• Circuit breakers are used to prevent damage to electrical equipment and wiring.

• They interrupt the flow of electricity when there is an overload, short circuit, or ground fault.

• Circuit breakers are commonly used in homes, businesses, and industrial settings.

• They come in different sizes and ratings depending on the application.

• Examples of circuit b...read more

Hazard identification is the process of identifying potential sources of harm in the workplace, while risk assessment involves evaluating the likelihood and severity of those hazards.

• Hazard identification involves identifying potential sources of harm such as chemicals, machinery, or ergonomic factors.

• Risk assessment involves evaluating the likelihood and severity of harm from these hazards.

• The goal is to implement controls to mitigate or eliminate the risks identified.

• Exampl...read more

Job safety analysis is a process of identifying potential hazards in a job task and implementing controls to mitigate risks.

• Involves breaking down a job task into steps

• Identifying potential hazards for each step

• Determining preventive measures to reduce risks

• Ensures workers are aware of safety procedures

• Examples: construction site JSA, manufacturing plant JSA

Execution of MS line, DI line, HDPE line involves proper planning, material selection, installation, and testing.

• Plan the layout and route of the lines based on project requirements and specifications.

• Select appropriate materials such as MS, DI, or HDPE based on factors like pressure rating, corrosion resistance, and cost.

• Ensure proper installation of the lines including welding, jointing, and fittings.

• Conduct pressure testing and leak testing to ensure the lines are function...read more

Fire safety refers to measures taken to prevent and protect against the risks of fire.

• Fire safety includes having working smoke detectors in place.

• It also involves creating and practicing a fire escape plan.

• Proper storage and handling of flammable materials is crucial for fire safety.

• Regular maintenance of fire extinguishers and other fire safety equipment is important.

• Training employees on fire safety protocols is essential for workplace safety.

A hazard site is a location where there is a potential risk of harm to people, property, or the environment.

• Hazard sites can include industrial facilities, chemical plants, nuclear power plants, and construction sites.

• These sites may contain hazardous materials, dangerous equipment, or unsafe conditions.

• Proper safety measures and protocols must be followed at hazard sites to prevent accidents and injuries.

• Examples of hazard sites include oil refineries, mines, and hospitals w...read more

The company has a comprehensive emergency plan in place to ensure the safety and well-being of employees and assets.

• The emergency plan should outline procedures for various scenarios such as fire, natural disasters, medical emergencies, and security threats.

• Designate specific roles and responsibilities for employees during an emergency.

• Regularly conduct drills and training sessions to ensure all employees are familiar with the emergency procedures.

• Maintain communication chann...read more

During a project, I led a team to troubleshoot and resolve issues with the HVAC system, resulting in improved energy efficiency.

• Identified inefficiencies in HVAC system

• Collaborated with team to develop solutions

• Implemented changes resulting in improved energy efficiency

• Regularly monitored system to ensure continued success