Techno Electric & Engineering Company Electrical Design Engineer Interview Questions and Answers

Transformer differential protection is a method to protect transformers from internal faults. CT sizing is determined based on the transformer's primary current rating.

• Transformer differential protection compares the currents entering and leaving the transformer to detect internal faults.

• Current transformers (CTs) are sized based on the transformer's primary current rating and the desired accuracy of the protection sch...read more

Unbalanced protection in electrical systems is a type of protection that detects and responds to imbalances in current or voltage levels.

• Unbalanced protection is used to detect faults such as phase-to-phase or phase-to-ground faults in electrical systems.

• It helps prevent damage to equipment and ensures the safety of personnel by quickly isolating the faulty section of the system.

• Examples of unbalanced protection device...read more

Yes, the use of a smartphone camera flasher is permitted while assessing old switchgears for modernization.

• Using a smartphone camera flasher can help illuminate dark areas and improve visibility while assessing old switchgears.

• It can assist in capturing clear and detailed images for documentation and analysis.

• Ensure that the flash does not interfere with any sensitive equipment or cause any safety hazards.

• Consider usin...read more

I am currently earning X amount and my salary expectations are Y amount.

• Mention your current CTC (Cost to Company)

• Clearly state your salary expectations

• Consider factors like experience, industry standards, and job responsibilities when stating salary expectations

Seeking new challenges and opportunities for growth.

• Desire for new challenges and learning opportunities

• Limited growth potential in current role

• Seeking a more innovative and dynamic work environment

During a site visit for assessing existing switchgear for retrofitting circuit breakers, inputs collected include equipment specifications, condition, age, and load requirements.

• Collect equipment specifications such as voltage rating, current rating, and interrupting capacity.

• Assess the condition of the existing switchgear to determine if it can accommodate the new circuit breakers.

• Consider the age of the switchgear to...read more

Seeking new challenges and opportunities for growth.

• Desire for new challenges and learning opportunities

• Limited growth potential in current role

• Seeking a more innovative and dynamic work environment

Seeking new challenges and opportunities for growth in a field that aligns more closely with my interests and skills.

• Desire for new challenges and opportunities

• Interest in pursuing a career that aligns better with skills and passions

• Seeking professional growth and development

• Exploring a field with more potential for advancement

• Wanting to broaden knowledge and experience in a different industry

My current CTC is $80,000 per year, and my expected CTC is $90,000 per year.

• Current CTC: $80,000 per year

• Expected CTC: $90,000 per year

• Reasons for expecting increase in CTC (if applicable)

Yes, I am open to relocation for the right opportunity.

• I am willing to relocate for the right job opportunity that aligns with my career goals.

• I am open to exploring new locations and experiencing different cultures.

• I understand that relocation may be necessary for career advancement and growth.

The different parts of a lathe machine include the bed, headstock, tailstock, carriage, chuck, tool post, and feed mechanism.

• Bed: It is the base of the lathe machine that supports all the other components.

• Headstock: It houses the main spindle, gears, and controls the speed of rotation.

• Tailstock: It provides support to the other end of the workpiece and can be moved along the bed.

• Carriage: It holds the cutting tool and ...read more

A chain design is primarily done by considering the desired function, load requirements, material selection, and manufacturing processes.

• Identify the purpose and function of the chain

• Determine the load requirements and calculate the necessary strength

• Select appropriate materials based on factors like strength, corrosion resistance, and cost

• Consider the manufacturing processes involved in producing the chain

• Design the c...read more

CB is a switch that can interrupt the circuit during fault conditions, while an isolator is a switch that can only isolate the circuit.

• CB is used for protection against overcurrent, short circuit, and earth fault

• Isolator is used for isolation of a circuit for maintenance or repair work

• CB can be operated manually or automatically, while isolator is operated manually only

• CB has contacts that can break the circuit, while

The rating of equipment in a substation is crucial for its efficient functioning.

• The rating of transformers should be based on the maximum load they are expected to carry.

• Circuit breakers should be rated for the maximum fault current they may encounter.

• Busbars should be rated for the maximum current they may carry.

• Lightning arresters should be rated for the maximum voltage they may encounter.

• The rating of capacitors sh...read more

A power transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.

• It is used to step up or step down the voltage of an alternating current (AC) power supply.

• It consists of two or more coils of insulated wire wound around a magnetic core.

• The primary coil is connected to the input voltage source and the secondary coil is connected to the output loa...read more

Different types of tests to be performed in power transformer

• Insulation resistance test

• Ratio test

• Polarity test

• Vector group test

• No-load test

• Load test

• Temperature rise test

Relays are used to control high voltage or current circuits with low voltage signals.

• Electromagnetic relays use an electromagnet to open or close a circuit.

• Solid-state relays use semiconductors to switch the circuit.

• Thermal relays protect motors from overheating by tripping the circuit when the temperature exceeds a set limit.

• Time delay relays are used to delay the opening or closing of a circuit for a specific time pe...read more