Technician/ Foreman - Electrical Interview Questions and Answers in 2025 (100+ Q&A)

Electrical Technician/ Foreman - Electrical

Ques:- What is the meaning and full form of AYFY CABLE?

Asked In :- saudi electricity company, btl india private ltd,

Right Answer:
AYFY cable stands for "Aluminum Conductor, PVC Insulated, PVC Sheathed, Flexible Cable."

Electrical Technician/ Foreman - Electrical

Ques:- Explain about SOURCING & SINKING concepts in PLC to field sensor wiring ?

Asked In :- Zamil Offshore, gpi,

Right Answer:
In PLC (Programmable Logic Controller) systems, "sourcing" and "sinking" refer to how input and output devices are connected to the power supply.

- **Sourcing**: In a sourcing configuration, the PLC provides the positive voltage to the field device (like a sensor). The device connects to the ground to complete the circuit. This means the current flows from the power source, through the device, and into the PLC.

- **Sinking**: In a sinking configuration, the PLC connects to the ground, and the field device provides the positive voltage. The device connects to the PLC input, allowing current to flow from the device into the PLC.

In summary, sourcing means the PLC supplies power, while sinking means the device supplies power to the PLC.

Electrical Technician/ Foreman - Electrical

Ques:- In a power transformer usuall which winding is closer to the core? (A) Primary winding (B) Secondary winding (C) Low Voltage winding (D) High Voltage winding

Asked In :-

Right Answer:
(C) Low Voltage winding

Electrical Technician/ Foreman - Electrical

Ques:- Whay we transmit power in 3phase no in 4 or 2 or 5……etc?

Asked In :-

Right Answer:
We transmit power in three phases because it provides a more efficient and balanced power supply, reduces the amount of conductor material needed, and allows for a constant power transfer, which minimizes fluctuations in voltage and current.

Electrical Technician/ Foreman - Electrical

Ques:- What is an SCR?

Asked In :- tektronix,

Right Answer:
An SCR, or Silicon Controlled Rectifier, is a four-layer semiconductor device used to control and switch electrical power. It can conduct current in one direction when triggered and can be turned off by removing the current.

Electrical Technician/ Foreman - Electrical

Ques:- How much KVAr bank reqired for 630 KVA transformer on full load for maintain power factor upto.99

Asked In :- Energytech Global, Gecko Robotics,

Right Answer:
To maintain a power factor of 0.99 for a 630 KVA transformer on full load, you would require approximately 63.0 kVAr of capacitor bank.

Electrical Technician/ Foreman - Electrical

Ques:- IS RTCC AND OLTC REQUIRED FOR 500 KVA 11KV/433V TRANSFORMER FOR AN INDUSTRY?

Asked In :-

Right Answer:
Yes, an RTCC (Remote Tap Changer Control) and OLTC (On-Load Tap Changer) are typically required for a 500 KVA 11KV/433V transformer in an industry to maintain voltage stability and manage load variations effectively.

Electrical Technician/ Foreman - Electrical

Ques:- What is servo motar?

Asked In :-

Right Answer:
A servo motor is a type of motor that provides precise control of angular position, speed, and acceleration, typically used in applications requiring accurate movement, such as robotics and automation systems.

Electrical Technician/ Foreman - Electrical

Ques:- What is rise time and half time

Asked In :- Force Motors, Allweld Engineers, national renewable energy laboratory,

Right Answer:
Rise time is the time taken for a signal to change from a specified low value to a specified high value, typically measured from 10% to 90% of the final value. Half time, or half-life, is the time required for a quantity to reduce to half its initial value, often used in the context of decay processes.

Electrical Technician/ Foreman - Electrical

Ques:- What is the d/f b/w iverter & converter.

Asked In :- Worley Parsons, Bharat Benz, bmw,

Right Answer:
An inverter converts DC (direct current) to AC (alternating current), while a converter can refer to a device that changes AC to DC or vice versa, or changes one form of DC to another.

Electrical Technician/ Foreman - Electrical

Ques:- What si the d/f b/w KVA & KWH, kvarh & kvar, kwh & kvarphase voltage & line voltage

Asked In :- long island rail road, acsa,

Right Answer:
KVA (Kilovolt-Amperes) measures apparent power, while KWH (Kilowatt-Hours) measures energy consumed over time. KVAR (Kilovolt-Amperes Reactive) measures reactive power, and KVARH (Kilovolt-Amperes Reactive Hours) measures reactive energy consumed over time. KWH is the actual energy used, while KVAR represents the energy that does not do useful work. Phase voltage is the voltage across a single phase, while line voltage is the voltage between two phases in a three-phase system.

Electrical Technician/ Foreman - Electrical

Ques:- Why we does earthing for transformer neutral point

Asked In :- B G Shirke Group, denso, vikram solar, jsw cement, saankhya labs pvt. ltd.,

Right Answer:
Earthing the transformer neutral point helps to ensure safety by providing a path for fault currents, stabilizing the voltage during normal operation, and protecting equipment from overvoltages.

Electrical Technician/ Foreman - Electrical

Ques:- How to decide the load on secondary of the tranformer

Asked In :-

Right Answer:
To decide the load on the secondary of the transformer, calculate the total power requirement of the connected devices in watts (W) or kilowatts (kW), and ensure it does not exceed the transformer's rated secondary capacity in volt-amperes (VA) or kilovolt-amperes (kVA).

Personal Questions round Technician/ Foreman - Electrical

Ques:- Describe a complex problem you have solved or haven't solved?

Asked In :- SKF,

Right Answer:
In a previous project, we faced a recurring issue with electrical outages due to overloaded circuits. I analyzed the load distribution and identified that several circuits were consistently exceeding their capacity. I proposed a redesign of the circuit layout, redistributing the loads more evenly and adding additional circuits where necessary. After implementing these changes, we significantly reduced outages and improved system reliability.

Electrical Technician/ Foreman - Electrical

Ques:- In 132 kv transformer , in which range of transformer oil bdv required ? if it has around 50-55 , then how it was insulated the winding ?

Asked In :- VECV, Waaree Energies, Beml,

Right Answer:
The required breakdown voltage (BDV) for transformer oil in a 132 kV transformer is typically above 30 kV. If the BDV is around 50-55 kV, it indicates that the oil is in good condition and can effectively insulate the windings.

Electrical Technician/ Foreman - Electrical

Ques:- In 132 kv substation ligtning arrestor(120 kv) connected to line. but line voltage comes to 132 kv, it operate or not???

Asked In :- enphase energy,

Right Answer:
No, the lightning arrestor will not operate correctly because it is rated for 120 kV, and the line voltage of 132 kV exceeds its rating.

Electrical Technician/ Foreman - Electrical

Ques:- Why the supply frequency used in America is 60Hz while thatused in India is 50Hz?,

Asked In :- saudi electricity company,

Right Answer:
The supply frequency in America is 60Hz primarily due to historical decisions made during the early development of electrical systems, while India adopted 50Hz, which was influenced by European standards.

Electrical Technician/ Foreman - Electrical

Ques:- What is state space method ? Why its used ?Can it applicable on linear, non-linear, 1st order, higherorder, homogeneous, non-homogeneous, open-loop , closedloops , stable & unstable systems ?

Asked In :- canadian natural resources limited (cnrl), qatargas,

Right Answer:
The state space method is a mathematical framework used to model and analyze dynamic systems by representing them in terms of state variables and equations. It is used because it allows for a comprehensive description of systems, including their inputs, outputs, and internal states.

Yes, the state space method can be applied to linear and non-linear systems, first-order and higher-order systems, homogeneous and non-homogeneous systems, as well as open-loop and closed-loop systems, regardless of their stability (stable or unstable).

Electrical Technician/ Foreman - Electrical

Ques:- Why should an electronics and communication engg. student should join TCS?

Asked In :-

Right Answer:
An electronics and communication engineering student should join TCS because it offers diverse opportunities to work on innovative projects, access to advanced technologies, a strong learning environment, and the chance to collaborate with experienced professionals in the field.

Electrical Technician/ Foreman - Electrical

Ques:- What is Difference Between Induction Motor & Servo Motor

Asked In :- Sanmina Corporation, team jaabaz - baja sae vit,

Right Answer:
Induction motors are generally used for constant speed applications and operate on the principle of electromagnetic induction, while servo motors are used for precise control of angular or linear position, speed, and acceleration, often incorporating feedback systems for accuracy.

The Technician / Foreman – Electrical category on takluu.com is thoughtfully crafted for professionals working in the electrical maintenance, installation, and supervision fields. Whether you are aiming for a technician-level job or stepping into a foreman or supervisory role, this section equips you with relevant knowledge and practical insight to clear interviews confidently.

This category covers a wide range of real-world electrical concepts and scenarios, including wiring diagrams, cable sizing, motor control circuits, panel board layouts, transformers, earthing systems, lighting systems, and emergency power setups. We also focus on safety standards (like OSHA, IS, or NEC codes), preventive maintenance, and energy efficiency practices.

Interviewers often expect you to not only understand theory but also explain how you would manage a breakdown, supervise a site installation, or coordinate with a team of electricians. That’s why our content includes scenario-based questions such as:

“What would you do if a circuit breaker trips repeatedly?”
“How do you test insulation resistance on a motor?”
“How would you plan manpower and material for an industrial wiring job?”

Whether you’re applying in a construction company, factory, MEP firm, facility management team, or government sector, this category boosts your confidence and technical clarity.

We regularly update this section to reflect the latest standards and practical trends in the electrical field. Each question is designed to help you think like a problem-solver, not just a technician.

Questions in: Technician/ Foreman - Electrical

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