Design Engineer - Electrical Interview Questions and Answers in 2025 (100+ Q&A)

Ques:- Can we connect 2.2kw star motor in delta passion?

Asked In :- pratt & whitney, colas rail,

Right Answer:
No, you cannot connect a 2.2 kW star motor in delta configuration if it is designed to operate in star. It must be connected in star to function properly.

Design Engineer - Electrical Electrical

Ques:- Why the transformer ratings in kva

Asked In :- marquardt india pvt. ltd,

Right Answer:
Transformers are rated in kVA (kilovolt-amperes) because they are designed to handle both voltage and current without considering the power factor. This rating reflects the apparent power, which is the product of voltage and current, and is independent of the type of load connected to the transformer.

Design Engineer - Electrical Electrical

Ques:- What are advantages of dc over ac supply?

Asked In :- Al-Ahleia Switchgear Co, Tecosim Engineering Services,

Right Answer:
1. Simplicity of design and control.
2. Easier to store in batteries.
3. No reactive power losses.
4. More efficient for low-voltage applications.
5. Better for electronic circuits and devices.
6. Constant voltage and current levels.

Design Engineer - Electrical Electrical

Ques:- How to calculate the current carrying capacity of a conductor. How it is related to diameter of cable or conductor

Asked In :- irving shipbuilding, gpi,

Right Answer:
The current carrying capacity of a conductor can be calculated using the formula:

[ I = frac{K cdot A cdot (T_{max} - T_{ambient})}{R} ]

where:
- ( I ) = current (in Amperes)
- ( K ) = a constant that depends on the material and installation conditions
- ( A ) = cross-sectional area of the conductor (in square meters)
- ( T_{max} ) = maximum allowable temperature of the conductor (in degrees Celsius)
- ( T_{ambient} ) = ambient temperature (in degrees Celsius)
- ( R ) = resistance of the conductor (in Ohms)

The diameter of the cable or conductor is related to its current carrying capacity because a larger diameter increases the cross-sectional area ( A ), which in turn allows more current to flow without overheating.

Design Engineer - Electrical Personal Questions round

Ques:- TELL US SOMETHING ABOUT OUR COLLEGE?

Asked In :- Virchow Biotech, Mirth Infratech, amreli steels limited,

Right Answer:
Your college is known for its strong engineering programs, innovative research opportunities, and a collaborative learning environment. It emphasizes hands-on experience and has a good reputation for preparing students for careers in the electrical engineering field.

Design Engineer - Electrical Electrical

Ques:- AVR is used for the Voltage regulation of the Generator using the feedback signal by exciting the field winding of the generator.But how the field winding will be excited & using what?

Asked In :-

Right Answer:
The field winding of the generator is excited using a DC supply from the generator's own output or an external power source, typically through a rectifier circuit that converts AC to DC. The Automatic Voltage Regulator (AVR) controls this excitation by adjusting the current supplied to the field winding based on the feedback signal from the generator's output voltage.

Design Engineer - Electrical Electrical

Ques:- Which lamp will fuse first(1)20(2)40(3)200 three lamps will fuse together

Asked In :- Mahagenco,

Right Answer:
The 20W lamp will fuse first.

Design Engineer - Electrical Electrical

Ques:- If power factor comes in leading & showing -0.95. Is thereany effect on electrical system? if yes, then please tell mewhat would be the effects. & how long we keep power factorin leading.Keeping power factor in leading shows more KW & less KVA isit correct or not.

Asked In :-

Right Answer:
Yes, a leading power factor of -0.95 can have effects on the electrical system. It can lead to issues such as overvoltage conditions, increased losses in transformers and capacitors, and potential resonance problems. Keeping a leading power factor is generally acceptable, but it should be managed carefully to avoid these issues.

Regarding the relationship between KW and KVA, a leading power factor does not show more KW and less KVA; rather, it indicates that the system is supplying reactive power back to the grid, which can affect the overall power quality.

Design Engineer - Electrical Electrical

Ques:- How can i check vortex shedder bar it is ok? if there is ohms condition are shown correct?

Asked In :- Bapco Bahrain Petroleum Company, Skyworks Solutions, stryker,

Right Answer:
To check if the vortex shedder bar is okay, use a multimeter to measure the resistance across the bar. If the ohm readings are within the manufacturer's specified range, the bar is functioning correctly. If the readings are outside this range, the bar may be faulty.

Design Engineer - Electrical Electrical

Ques:- What are the safety devices in generator.

Asked In :- SPX FLOW, givaudan, dstl,

Right Answer:
The safety devices in a generator include:

1. Overload protection relay
2. Short circuit protection
3. Ground fault protection
4. Low oil pressure shutdown
5. High temperature shutdown
6. Voltage regulation system
7. Circuit breakers
8. Emergency stop switch

Design Engineer - Electrical Personal Questions round

Ques:- Describe your school days

Asked In :- wocom,

Right Answer:
My school days were a mix of learning and personal growth. I enjoyed subjects like math and science, participated in various extracurricular activities, and built lasting friendships. I faced challenges, but they helped me develop resilience and teamwork skills. Overall, those years shaped my interests and values.

Design Engineer - Electrical Electrical

Ques:- How to calculate the capacitor rating for improving power factor

Asked In :- Belden, elv,

Right Answer:
To calculate the capacitor rating for improving power factor, use the formula:

[ Q_c = P times (tan(phi_1) - tan(phi_2)) ]

Where:
- ( Q_c ) = reactive power of the capacitor in VAR (Volt-Ampere Reactive)
- ( P ) = active power in watts (W)
- ( phi_1 ) = initial power factor angle
- ( phi_2 ) = desired power factor angle

1. Determine the initial power factor (PF1) and the desired power factor (PF2).
2. Calculate the angles using ( phi = cos^{-1}(PF) ).
3. Substitute the values into the formula to find the required capacitor rating in VAR.

Design Engineer - Electrical Electrical

Ques:- SPEAK ON LARGE HADRON COLLIDER(LHC)?

Asked In :- SKF,

Right Answer:
The Large Hadron Collider (LHC) is the world's largest and most powerful particle accelerator, located at CERN near Geneva, Switzerland. It collides protons at high energies to study fundamental particles and forces, helping scientists explore the origins of mass, the existence of the Higgs boson, and other aspects of particle physics. The LHC consists of a 27-kilometer ring of superconducting magnets and detectors, allowing researchers to observe particle interactions at unprecedented energy levels.

Design Engineer - Electrical Electrical

Ques:- Through which medium return supply given to alternator

Asked In :-

Right Answer:
The return supply to an alternator is given through the neutral point of the winding.

Design Engineer - Electrical Electrical

Ques:- If I have a motor of 1MW with 6.6kv, running at 35% load, how can i save energy without reducing the load ?

Asked In :- Bobst India,

Right Answer:
You can save energy by using a variable frequency drive (VFD) to optimize the motor's speed and torque, improving efficiency at lower loads. Additionally, consider implementing power factor correction and regular maintenance to ensure the motor operates efficiently.

Design Engineer - Electrical Electrical

Ques:- In hydro plant,generally we install vertical hydrogenerators..why dont we recommend horizontal one??

Asked In :- volkerrail, eko electricity distribution plc,

Right Answer:
Vertical hydrogenerators are preferred in hydro plants because they efficiently handle high water flow and pressure, require less space, and allow for easier maintenance and installation in varying water levels. Horizontal generators are less efficient in these conditions and can be more complex to install and maintain.

Design Engineer - Electrical Electrical

Ques:- What is the working principle of contactor and conditions ofnormal open and normal close on it?

Asked In :- smec, samsung sdi, sydney trains,

Right Answer:
A contactor is an electrically controlled switch used to control a high-power circuit. It works on the principle of electromagnetism: when an electrical current flows through the coil, it generates a magnetic field that attracts a movable armature, closing the contacts and allowing current to flow through the load.

In normal open (NO) condition, the contacts are open when the coil is de-energized and close when the coil is energized. In normal close (NC) condition, the contacts are closed when the coil is de-energized and open when the coil is energized.

Design Engineer - Electrical Personal Questions round

Ques:- What is the punch line of iob????????

Asked In :-

Right Answer:
The punch line of IOB (Indian Overseas Bank) is "Good People to Grow With."

Design Design Engineer - Electrical

Ques:- How will u define rating of a resistance?

Asked In :- Learningmate Solutions, Lucid Software, Octopus, Triumph Motorcycles, Sonova, Fraser Health, Mantle Developments, arcadis, arup, smec,

Right Answer:
The rating of a resistor is defined by its resistance value (in ohms), power rating (in watts), and tolerance (percentage), which indicate how much the resistance can vary from its stated value.

Design Design Engineer - Electrical

Ques:- Difference b/w KV and KWA

Asked In :- Learningmate Solutions, KareXpert Technologies, Virgo Engineers, Perkins & Will, 3d Internet, University of the Saarland, Umang, Eteros, The Pokemon Company International, awe,

Right Answer:
KV (Kilovolt) is a unit of electrical voltage, while KVA (Kilovolt-Ampere) is a unit of apparent power in an electrical circuit. KV measures the potential difference, whereas KVA measures the total power used by the electrical system, including both active and reactive power.

The Design Engineer – Electrical category on takluu.com is tailored for professionals and aspirants aiming to excel in electrical design roles. Electrical design engineers are responsible for planning, developing, and validating electrical systems for various applications, including power distribution, control systems, and electronics.

This section covers essential topics such as electrical circuit design, schematic diagrams, CAD software (like AutoCAD Electrical), wiring layouts, load calculations, and compliance with standards like IEC and NEC. You’ll also find questions related to design optimization, troubleshooting, protective devices, and safety protocols.

Interview questions often explore practical scenarios, for example:

“How do you approach designing a power distribution system?”
“Explain the use of AutoCAD Electrical in schematic design.”
“What factors do you consider for electrical load calculations?”

Our content presents complex design concepts in a clear and concise manner, supported by real-world examples and best practices. Whether you are fresh in the field or an experienced engineer, this category helps you prepare confidently for technical interviews and project discussions.

At Takluu, we keep this category updated with the latest tools, software advancements, and industry trends, ensuring you stay current and competitive in the electrical design domain.

Questions in: Design Engineer - Electrical

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