Electrical Design Engineer
10+ Electrical Design Engineer Interview Questions and Answers for Freshers
Q1. Explain the steps involved in Load List preparation and how you arrive at Transformer Sizing via Load list
Load list preparation involves identifying all electrical loads in a system and determining their power requirements to size transformers.
Identify all electrical loads in the system, including lighting, equipment, HVAC, etc.
Determine the power requirements of each load in terms of voltage, current, and power factor.
Sum up the power requirements of all loads to calculate the total load on the system.
Select an appropriate transformer size based on the total load and any future ...read more
Q2. What are the different softwares in Electrical Engineering
Softwares used in Electrical Engineering include CAD, simulation, and analysis tools.
CAD software like AutoCAD and SolidWorks are used for designing electrical systems and components
Simulation software like MATLAB and Simulink are used to model and simulate electrical systems
Analysis software like ETAP and PSCAD are used to analyze and optimize electrical systems
Other software like LabVIEW and Altium Designer are also used in Electrical Engineering
Q3. How do you calculate current from Kw,pf,Voltage given?
Current can be calculated using the formula: Current (A) = Power (kW) / (sqrt(3) x Voltage (V) x Power Factor)
Use the formula: Current (A) = Power (kW) / (sqrt(3) x Voltage (V) x Power Factor)
Make sure to convert kW to W if necessary (1 kW = 1000 W)
Ensure the power factor is a decimal value, not a percentage (e.g. 0.85 instead of 85%)
Q4. Explain power and control wiring of star delta starter.
Power and control wiring of star delta starter involves connecting the motor to the power supply and control circuit using a specific wiring diagram.
Power wiring involves connecting the three-phase power supply to the motor through the main contactor.
Control wiring involves connecting the control circuit to the motor through the timer and the star-delta contactor.
During starting, the motor is connected in star configuration to reduce the starting current and then switched to ...read more
Q5. What are the different types of tools in AutoCAD
AutoCAD has various tools for different purposes such as drawing, editing, and annotation.
Drawing tools: line, circle, arc, rectangle, polygon, etc.
Editing tools: move, copy, rotate, scale, mirror, etc.
Annotation tools: text, dimension, hatch, leader, etc.
Miscellaneous tools: layer, block, attribute, inquiry, etc.
Q6. Explain abt micro grid and my interest over electrical engineer
Microgrid is a localized group of electricity sources and loads that normally operates connected to and synchronous with the traditional centralized grid.
Microgrid is a small-scale power grid that can operate independently or in conjunction with the main power grid.
It can include distributed energy resources like solar panels, wind turbines, and batteries.
Microgrids are often used to increase energy reliability, reduce costs, and integrate renewable energy sources.
As an elect...read more
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Q7. Explain the protection used for Transformer
Various protection methods are used for transformers to ensure safe operation and prevent damage.
Overcurrent protection: Protects against excessive current flow through the transformer.
Overload protection: Prevents the transformer from overheating due to prolonged high current.
Differential protection: Compares the current entering and leaving the transformer to detect internal faults.
Buchholz relay: Detects and signals the presence of gas or oil in the transformer, indicating...read more
Q8. order of Cable size from 4 sqmm?
The order of cable sizes from 4 sqmm is 6 sqmm, 10 sqmm, 16 sqmm, 25 sqmm, 35 sqmm, 50 sqmm, 70 sqmm, 95 sqmm, 120 sqmm, 150 sqmm, 185 sqmm, 240 sqmm, 300 sqmm, 400 sqmm, 500 sqmm, 630 sqmm, 800 sqmm, 1000 sqmm.
6 sqmm
10 sqmm
16 sqmm
25 sqmm
35 sqmm
50 sqmm
70 sqmm
95 sqmm
120 sqmm
150 sqmm
185 sqmm
240 sqmm
300 sqmm
400 sqmm
500 sqmm
630 sqmm
800 sqmm
1000 sqmm
Electrical Design Engineer Jobs
Q9. What is Revit and AutoCAD
Revit and AutoCAD are computer-aided design software used in architecture, engineering, and construction industries.
Revit is a BIM (Building Information Modeling) software used for 3D modeling, design, and documentation of building projects.
AutoCAD is a CAD (Computer-Aided Design) software used for 2D and 3D drafting, modeling, and visualization of various designs.
Both software are widely used in the AEC (Architecture, Engineering, and Construction) industries for designing a...read more
Q10. What is electricity?
Electricity is the flow of electrons through a conductor.
Electricity is a form of energy that powers most of our modern devices.
It is created by the movement of electrons from one atom to another.
Electricity can be generated from various sources such as coal, wind, solar, and hydro power.
It can be dangerous if not handled properly and can cause electric shock or fire.
Electricity is measured in units of volts, amps, and watts.
Q11. Voltage drop Calculation Parameters?
Voltage drop calculation parameters include conductor material, length, cross-sectional area, current, and temperature.
Conductor material affects resistance and therefore voltage drop.
Length of the conductor directly impacts voltage drop.
Cross-sectional area of the conductor affects resistance and voltage drop.
Current flowing through the conductor influences voltage drop.
Temperature can also affect the resistance of the conductor and subsequently voltage drop.
Q12. Difference between relay and ckt breaker
Relays are used to control circuits by opening or closing contacts based on electrical signals, while circuit breakers are designed to protect circuits from overloads and short circuits by interrupting the flow of current.
Relays are used for switching purposes, while circuit breakers are used for protection purposes.
Relays operate based on electrical signals, while circuit breakers respond to current flow.
Relays have contacts that physically open and close, while circuit brea...read more
Q13. Eplan features and use in project report
Eplan is a software used for electrical design engineering to create project reports.
Eplan allows for efficient creation of electrical schematics and documentation
It helps in automating repetitive tasks and ensuring consistency in designs
Eplan can generate reports for bill of materials, wiring diagrams, and panel layouts
The software also facilitates collaboration among team members working on the same project
Q14. Explain Earthing Calculation steps
Earthing calculation steps involve determining the resistance of the earthing system to ensure safety and proper functioning of electrical equipment.
Determine the soil resistivity of the area where the earthing system will be installed.
Calculate the required earth resistance based on the type of installation and equipment being used.
Select the appropriate type and size of earthing electrodes based on the calculated resistance.
Design the layout of the earthing system to ensure...read more
Q15. Explain Lightning calculation steps
Lightning calculation steps involve determining the distance of a lightning strike based on the time delay between seeing the flash and hearing the thunder.
Measure the time delay between seeing the lightning flash and hearing the thunder.
Divide the time delay by 5 to get the distance in miles.
For example, if the time delay is 10 seconds, the lightning struck 2 miles away.
Remember that sound travels at approximately 1 mile every 5 seconds.
Q16. Detais about LSIG protection
LSIG protection refers to Long-Time, Short-Time, Instantaneous, and Ground fault protection settings in circuit breakers.
LSIG protection is commonly used in circuit breakers to provide comprehensive protection against various types of faults.
Long-Time setting protects against overloads by allowing the circuit breaker to trip after a specified time delay.
Short-Time setting protects against short circuits by tripping the circuit breaker faster than the Long-Time setting.
Instant...read more
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