1000+ Electrical Engineer Interview Questions and Answers

You are standing at the North Pole.

• Walking one mile south takes you one mile away from the North Pole.

• Walking one mile west takes you in a circle around the North Pole.

• Walking one mile north brings you back to the North Pole, where you started.

SAP procedure for UPS vendor is a process for managing vendor data in the SAP system.

• The SAP procedure for UPS vendor involves creating and maintaining vendor master data in the system.

• It includes defining vendor attributes such as payment terms, delivery schedules, and contact information.

• The procedure also involves creating purchase orders and managing invoices from the vendor.

• Examples of UPS vendors include APC, Eaton, and Tripp Lite.

CT and PT are electrical transformers used in power systems to measure current and voltage respectively.

• CT stands for Current Transformer and is used to measure high currents in power systems.

• PT stands for Potential Transformer and is used to measure high voltages in power systems.

• CTs are connected in series with the load while PTs are connected in parallel with the load.

• CTs are used to measure current for protection and metering purposes while PTs are used for metering and c...read more

Transformer PM involves regular maintenance and inspection to ensure optimal performance.

• Perform regular visual inspections to check for signs of wear and tear

• Test insulation resistance to ensure it meets standards

• Check oil levels and perform oil analysis to detect any contaminants

• Inspect and tighten connections

• Perform load and temperature tests

• Schedule maintenance based on manufacturer recommendations

• Examples of maintenance tasks include cleaning, lubrication, and replacing ...read more

I have used several development tools throughout my career.

• I have experience with IDEs such as Eclipse, Visual Studio, and Xcode.

• I have used version control systems like Git and SVN.

• I am familiar with debugging tools like GDB and LLDB.

• I have worked with simulation tools like LTSpice and MATLAB.

• I have also used various programming languages and frameworks such as C++, Java, Python, and Django.

I am comfortable working with Windows, Linux and MacOS operating systems.

• Proficient in Windows OS and its various versions

• Familiar with Linux OS and its distributions like Ubuntu, Fedora, and CentOS

• Experienced in MacOS and its versions like Mojave and Catalina

Home's law is a principle that states that the current flowing through a conductor is directly proportional to the voltage applied across it.

• Home's law is also known as Ohm's law.

• It is expressed as I = V/R, where I is the current, V is the voltage, and R is the resistance.

• This law is fundamental to the study of electrical circuits and is used to calculate the behavior of circuits.

• For example, if the voltage across a resistor is increased, the current through it will also incr...read more

The electrical equipment in our plant includes generators, transformers, switchgear, motors, control panels, and lighting fixtures.

• Generators: Used to produce electrical power.

• Transformers: Used to step up or step down voltage levels.

• Switchgear: Used for controlling, protecting, and isolating electrical equipment.

• Motors: Used to convert electrical energy into mechanical energy.

• Control panels: Used for monitoring and controlling various electrical systems.

• Lighting fixtures: Us...read more

An LPG plant is a facility that processes and stores liquefied petroleum gas. It requires various electrical and electronic equipment for its operations.

• LPG plant is a facility that processes and stores liquefied petroleum gas

• Electrical equipment in an LPG plant includes transformers, switchgear, motors, and control panels

• Electronic equipment in an LPG plant includes sensors, transmitters, and PLCs

• Examples of electrical equipment: power distribution systems, motor control cen...read more

This question covers various electrical engineering topics including earthing systems, transformer selection, and motor protection.

• Earthing Systems: Common types include TT (Terra-Terra), TN (Terra-Neutral), and IT (Isolated Terra) systems, each with specific applications and standards.

• Transformer Selection: Consider factors like load requirements, efficiency, and protection features such as fuses, circuit breakers, and relays.

• MCC Panel Relay Coordination: Ensure proper setti...read more

Answering questions related to transformer tests, BDB value, relay types, pole types, and conductor ground clearance in 33kv.

• Transformer tests include insulation resistance, turns ratio, and polarity tests.

• BDB value refers to the breakdown voltage of insulating oil.

• Types of relays include overcurrent, differential, and distance relays.

• Types of poles used in 33kv include wooden, steel, and concrete poles.

• Conductor ground clearance is determined by the voltage level and environ...read more

Maruti Suzuki's training procedure focuses on skill development, hands-on experience, and continuous learning for engineers.

• Induction Training: New employees undergo orientation to understand company culture and processes.

• Technical Training: Engineers receive specialized training on automotive technologies and manufacturing processes.

• On-the-Job Training: Practical experience is gained through real-time projects and tasks under supervision.

• Soft Skills Development: Workshops on...read more

Transistors are electronic devices used to amplify or switch electronic signals and power. They are essential components in various applications.

• Amplification of weak signals in audio and radio frequency systems

• Switching and control of electronic circuits in computers and digital devices

• Power regulation and control in power supplies and motor control systems

• Signal processing and amplification in communication systems

• Memory storage and logic operations in integrated circuits

• Vo...read more

Common alarms associated with a VMC include tool wear, tool breakage, spindle overload, and coolant level.

• Tool wear alarm indicates the need to replace the cutting tool due to wear and tear.

• Tool breakage alarm alerts when a cutting tool breaks during machining.

• Spindle overload alarm warns of excessive load on the spindle, which can lead to damage.

• Coolant level alarm signals when the coolant level in the machine is low, affecting machining performance.

Common alarms associated with Variable Frequency Drives (VFD) include overvoltage, undervoltage, overcurrent, overtemperature, and ground fault.

• Overvoltage alarm: occurs when the voltage supplied to the VFD exceeds the specified limit.

• Undervoltage alarm: triggered when the voltage supplied to the VFD falls below the specified limit.

• Overcurrent alarm: indicates that the current drawn by the VFD exceeds the rated value.

• Overtemperature alarm: alerts when the temperature of the V...read more

The measurement of current and voltage is crucial for smart meter projects. Different types of relays are used for protection and load switching in energy meters. Type tests are conducted at CPRI/ERDA for product testing.

• Measurement of current and voltage is done using sensors and sampling techniques in smart meter projects.

• Relays used in energy meters include protection relays and load switches.

• Type tests are conducted at CPRI/ERDA to ensure the quality and performance of th...read more

Norton representation is preferred when the load impedance is known and fixed.

• Norton representation is preferred when the load impedance is known and fixed, as it simplifies calculations.

• Thevenin representation is preferred when the load impedance is unknown or variable.

• Norton equivalent circuits are easier to analyze in terms of current flow and power calculations.

• Thevenin equivalent circuits are easier to analyze in terms of voltage and resistance calculations.

Questions related to SLD, transformer, DG, interlocking, PM, reports, and SAP knowledge for Electrical Engineer position.

• SLD of power flow in current company

• Ratings of transformer and DG

• Interlocking for a Circuit breaker with SLD

• Checklist of DG i.e types of checks used for DG

• Preventive maintenance of DG

• PM of a motor

• Types of reports/logbook made

• SAP knowledge

The OLTC (On-Load Tap Changer) in a transformer is typically connected to the high voltage side.

• OLTC is connected to the high voltage winding of the transformer

• It allows for tap changing while the transformer is energized

• The low voltage side remains fixed while the high voltage side can be adjusted

AC stands for alternating current and DC stands for direct current.

• AC is a type of electrical current that periodically changes direction.

• DC is a type of electrical current that flows in one direction.

• AC is commonly used in household appliances and power distribution systems.

• DC is commonly used in batteries and electronic devices.

• Examples of AC sources include power grids and generators.

• Examples of DC sources include batteries and solar panels.

Different types of tests related to transformers include routine tests, type tests, and special tests.

• Routine tests are performed on every transformer and include measurement of winding resistance, insulation resistance, and voltage ratio.

• Type tests are performed on a sample transformer to verify its design and include temperature rise test, impulse test, and short-circuit test.

• Special tests are performed on transformers with specific requirements and include noise level test...read more

We use Allen Bradley PowerFlex VFD drivers in our plant.

• Our plant uses VFD drivers for controlling the speed of AC motors.

• Allen Bradley PowerFlex VFD drivers are known for their reliability and performance.

• These drivers offer a wide range of features such as overload protection, fault diagnostics, and energy savings.

• We have installed these drivers in various applications such as pumps, fans, and conveyors.

• Our maintenance team is trained to troubleshoot and repair these driver...read more

Lightning arresters are used in transmission lines to protect the equipment and infrastructure from damage caused by lightning strikes.

• Lightning arresters divert the high voltage surge caused by lightning strikes to the ground, preventing it from damaging the transmission lines.

• They provide a low-resistance path for the lightning current to flow, reducing the risk of electrical breakdown and flashovers.

• Lightning arresters help in maintaining the insulation levels of the trans...read more

Different methods of resistance measurement and their ranges

• Low resistance measurement: 4-wire Kelvin method, range 0.1 μΩ to 1 Ω

• Medium resistance measurement: 2-wire method, range 1 Ω to 1 MΩ

• High resistance measurement: Megohmmeter method, range 1 MΩ to 10 TΩ

• Other methods include 3-wire method and 4-wire guarded method

• Measurement accuracy depends on the method used and the quality of the equipment

Switchgear is an electrical equipment that controls, protects, and isolates electrical circuits.

• Switchgear is used to control power supply in electrical systems.

• It protects electrical equipment from damage caused by overloads, short circuits, and faults.

• Types of switchgear include low voltage, medium voltage, and high voltage switchgear.

• Relays are used in switchgear to control the flow of electricity.

• Types of relays include electromagnetic, thermal, and solid-state relays.

Copper (Cu) conductor will take larger current than Aluminum (Al) conductor of the same size.

• Copper has a higher electrical conductivity than Aluminum.

• Copper has a lower resistivity than Aluminum.

• Copper has better thermal conductivity than Aluminum.

• Copper is more commonly used in high-current applications.

• Aluminum is often used in overhead power transmission lines due to its lighter weight.

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