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

Ques:- How can we calibrate RADAR LEVEL transmitter 0% to 100%

Asked In :- b&r industrial automation, kinder morgan pipeline,

Right Answer:
To calibrate a RADAR level transmitter from 0% to 100%, follow these steps:

1. **Install the transmitter** at the desired location above the measurement point.
2. **Set the transmitter to the calibration mode** as per the manufacturer's instructions.
3. **Fill the tank or measurement area** to the 0% level (empty) and record the output signal.
4. **Fill the tank to the 100% level** (full) and record the output signal.
5. **Adjust the transmitter settings** using the recorded values to ensure that the output corresponds accurately to the 0% and 100% levels.
6. **Perform intermediate checks** at various levels (e.g., 25%, 50%, 75%) to ensure linearity and accuracy.
7. **Finalize the calibration** by saving the settings and exiting the calibration mode.

Always refer to the specific manufacturer's guidelines for detailed calibration procedures.

Design Engineer - Electrical Electrical

Ques:- Why always electric field is linked with magnetic field???

Asked In :- alstom,

Right Answer:
Electric fields and magnetic fields are linked because they are both components of electromagnetic fields, as described by Maxwell's equations. A changing electric field generates a magnetic field, and a changing magnetic field generates an electric field, leading to the phenomenon of electromagnetic induction.

Design Engineer - Electrical Electrical

Ques:- What do you mean by zener breakdown and avalanche breakdown?

Asked In :-

Right Answer:
Zener breakdown occurs in a diode when the reverse voltage exceeds a certain threshold, allowing current to flow in the reverse direction due to the strong electric field, typically at low voltages (below 5-6V). Avalanche breakdown, on the other hand, happens at higher reverse voltages when the electric field is strong enough to accelerate free electrons, causing them to collide with atoms and create more charge carriers, leading to a large increase in current.

Design Engineer - Electrical Electrical

Ques:- Why cant we use mV instead of mA?

Asked In :- Bosch Rexroth India Ltd, Subros Ltd, sarawak energy berhad,

Right Answer:
We can't use mV instead of mA because voltage (mV) measures electrical potential, while current (mA) measures the flow of electric charge. In most applications, especially in circuits, current is what drives the operation of devices, while voltage alone does not indicate how much current is flowing.

Design Engineer - Electrical Electrical

Ques:- Which is remain unchanged in transformer action?

Asked In :- Urenco, Commercial Vehicle,

Right Answer:
The frequency remains unchanged in transformer action.

Design Engineer - Electrical Personal Questions round

Ques:- WHAT IS UR DAILY ROUTINE IN UR SCHOOL TIME?

Asked In :- sun mobility,

Right Answer:
My daily routine during school time typically included waking up early, attending classes, participating in extracurricular activities, completing homework, and studying in the evenings. I also made time for meals and relaxation with friends and family.

Design Engineer - Electrical Electrical

Ques:- Suppose in dcs range of a flow transmitter is 10t/hr what is dp for 50% in 2500mmwc

Asked In :- smiths detection, newfoundland & labrador hydro,

Right Answer:
The differential pressure (dp) for 50% of the range in a flow transmitter with a range of 10 t/hr and a full scale of 2500 mmwc is 1250 mmwc.

Design Engineer - Electrical Personal Questions round

Ques:- How can you convince me that you can do a sales job eventhough you don't have any sales experience.

Asked In :-

Right Answer:
I can demonstrate my ability to succeed in a sales role by highlighting my strong communication skills, problem-solving abilities, and willingness to learn. I have experience in understanding customer needs and building relationships, which are crucial in sales. Additionally, I am motivated and adaptable, and I can quickly learn the necessary sales techniques and product knowledge to effectively engage with clients.

Design Engineer - Electrical Electrical

Ques:- What is meant by H.R.C fuse?

Asked In :- dlr, dover corporation,

Right Answer:
H.R.C fuse stands for High Rupturing Capacity fuse, which is designed to safely interrupt high fault currents without causing damage to the electrical system.

Design Engineer - Electrical Electrical

Ques:- What phase difference between p and s winding of transformer

Asked In :-

Right Answer:
The phase difference between the primary (p) and secondary (s) windings of a transformer is typically 180 degrees.

Design Engineer - Electrical Electrical

Ques:- Short circuit test of transformer gives what?

Asked In :-

Right Answer:
The short circuit test of a transformer gives the equivalent series resistance (R) and reactance (X) of the transformer, as well as the copper losses at full load.

Design Engineer - Electrical Electrical

Ques:- Which one is easy to control AC or DC Machine?

Asked In :- north oil company,

Right Answer:
DC machines are generally easier to control than AC machines.

Design Engineer - Electrical Electrical

Ques:- Why DC excitation is used for alternators? Why cant it be AC?

Asked In :- walton group,

Right Answer:
DC excitation is used for alternators because it provides a stable and controllable magnetic field, which is essential for producing a consistent output voltage. AC excitation would result in fluctuating magnetic fields, making it difficult to maintain the desired voltage and performance.

Design Engineer - Electrical Electrical

Ques:- How can you access index

Asked In :- GMM Pfaudler, E-T-A, rebar design & detail (p) ltd, lc,

Right Answer:
You can access an index in an array or list by using its position number in square brackets. For example, in Python, you would use `array[index]`, where `index` is the position you want to access, starting from 0.

Design Engineer - Electrical Electrical

Ques:- If carbon brushes spring tension either loose or tight, what happen on Motor performance During Full load Operation?

Asked In :- Jindal Aluminium, KSE Electricals, shriram pistons & rings ltd., jtag technologies,

Right Answer:
If carbon brushes have loose spring tension, it can lead to poor contact with the commutator, resulting in increased sparking, overheating, and reduced motor efficiency. If the tension is too tight, it can cause excessive wear on the brushes and commutator, leading to increased friction, heat, and potential motor damage. Both conditions negatively affect motor performance during full load operation.

Design Engineer - Electrical Electrical

Ques:- What is the current rating of 2500 KVA,33KV/433v transformeron secondary(LT) side

Asked In :- Horner Engineering India, paccar,

Right Answer:
The current rating on the secondary (LT) side of a 2500 KVA, 33KV/433V transformer is approximately 3,200 Amperes.

Design Engineer - Electrical Electrical

Ques:- ON RADAR INTERFACE LEVEL TRANSMITTER IF DI-ELECRIC IS WRONG WITH CONTINIUS PROCESS THAN HOW CAN INDENTIFY OR HOW CAN I PUT NEW DI-ELECTRIC VALUE?(ROSEMOUNT-TDR-3300-COXIAL PROBE TYPE)

Asked In :-

Right Answer:
To identify the wrong dielectric value in a Rosemount TDR 3300 coaxial probe type transmitter, you can perform the following steps:

1. **Check Calibration**: Verify the calibration of the transmitter against known dielectric constants.
2. **Inspect the Probe**: Ensure the probe is clean and free from any obstructions or damage.
3. **Use Diagnostic Tools**: Utilize the transmitter's diagnostic features to check for errors or inconsistencies in the readings.
4. **Adjust Settings**: If the dielectric constant is incorrect, access the transmitter's configuration settings to input the correct dielectric value based on the material being measured.
5. **Consult Documentation**: Refer to the user manual for specific instructions on adjusting dielectric values and troubleshooting.

If necessary, contact technical support for further assistance.

Design Engineer - Electrical Electrical

Ques:- What are the insulation properties.

Asked In :- long island rail road, ise,

Right Answer:
Insulation properties refer to the ability of a material to resist the flow of electric current, heat, or sound. Key insulation properties include:

1. **Dielectric Strength**: The maximum electric field a material can withstand without breaking down.
2. **Insulation Resistance**: The resistance offered by the material to the flow of electric current.
3. **Thermal Conductivity**: The ability of a material to conduct heat; lower values indicate better insulation.
4. **Moisture Resistance**: The ability to resist moisture absorption, which can degrade insulation performance.
5. **Chemical Resistance**: The ability to withstand chemical exposure without losing insulating properties.

Design Engineer - Electrical Personal Questions round

Ques:- WHAT IS THE IMPORTANCE OF MS EXCEL & MS- WORD AND WHAT ARE ITS MAIN APPLICATION IN COMPANIES

Asked In :-

Right Answer:
MS Excel is important for data analysis, financial modeling, and creating charts and graphs. It helps in organizing and manipulating large datasets efficiently. MS Word is essential for document creation, formatting, and collaboration on reports and proposals. Both tools enhance productivity, improve communication, and support decision-making in companies.

Design Engineer - Electrical Electrical

Ques:- Star Delta Diagram with full description

Asked In :- ndf, cape electrical supply, ola,

Right Answer:
A Star Delta Diagram is used to illustrate the connection of a three-phase induction motor during starting.

1. **Star Connection (Y)**: In this configuration, the three windings of the motor are connected in a star shape. Each winding is connected to a common neutral point. This reduces the voltage across each winding to 1/√3 (approximately 58%) of the line voltage, which limits the starting current and torque.

2. **Delta Connection (Δ)**: After the motor reaches a certain speed, the connection is switched to delta. In this configuration, the windings are connected end-to-end, forming a closed loop. This allows the motor to operate at full line voltage, providing maximum torque and efficiency.

**Diagram Representation**:
- **Star Connection**:
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- **Delta Connection**:
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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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