10+ Executive Engineer Electrical Interview Questions and Answers

Energy efficient compressors are designed to minimize energy consumption and maximize performance in both short and long run.

• Energy efficient compressors are designed with advanced technologies and features to reduce energy consumption.

• They have improved motor efficiency, reduced friction losses, and optimized control systems.

• These compressors are designed to operate at higher efficiency levels, resulting in lower energy costs.

• They may incorporate variable speed drives to mat...read more

Vector group of transformers is used to determine the phase difference and voltage ratio between primary and secondary windings.

• Vector group helps in determining the correct connection of transformers in parallel.

• It helps in identifying the phase angle difference between primary and secondary windings.

• It helps in determining the voltage ratio between primary and secondary windings.

• Vector group is important for power system stability and protection.

• Examples of vector groups in...read more

Designing a 100 KVR capacitor for 415 volts.

• Calculate the required capacitance using the formula C = I / (2 * pi * f * V)

• Select a suitable type of capacitor based on the application and voltage rating

• Ensure proper installation and maintenance to prevent failure or damage

• Consider safety precautions when working with high voltage capacitors

IR value is a measure of insulation resistance in transformers and motors.

• IR value indicates the condition of insulation in transformers and motors.

• It is measured in megaohms (MΩ) using a megger.

• A high IR value indicates good insulation while a low value indicates poor insulation.

• Regular testing of IR value is important to prevent breakdowns and ensure safety.

• For example, a transformer with an IR value of less than 1 MΩ may need to be replaced.

• Similarly, a motor with an IR va...read more

Switchgear selection for a 75 kW motor depends on various factors such as voltage, current, starting method, and protection requirements.

• Consider the voltage and current rating of the motor

• Choose the appropriate starting method such as DOL, star-delta, soft starter, or VFD

• Select the switchgear with suitable protection features such as overload, short circuit, and earth fault protection

• Ensure compatibility with the existing electrical system

• Examples of switchgear include circu...read more

It's not professional to speak negatively about specific organizations.

Transformers are electrical devices that transfer electrical energy between two or more circuits through electromagnetic induction.

• Transformers consist of two coils of wire, known as the primary and secondary coils.

• They work on the principle of electromagnetic induction.

• Transformers can step up or step down voltage levels.

• Examples of transformers include power transformers used in electrical substations.

Transformer principle involves electromagnetic induction to transfer electrical energy between two or more circuits.

• Transformers work based on Faraday's law of electromagnetic induction.

• They consist of primary and secondary coils wound around a core.

• Step-up transformers increase voltage while step-down transformers decrease voltage.

• Efficiency of transformers is determined by the ratio of output power to input power.

Motor mounting codes refer to the standards and regulations that dictate how motors should be installed and secured in various applications.

• Motor mounting codes ensure proper installation and safety of motors

• Codes may specify mounting methods, materials, and clearances

• Examples include NEC Article 430 for electrical motor installations