Junior Electrical Maintenance Engineer Interview Questions and Answers

To start an HT motor with a soft starter, the soft starter gradually increases the voltage to the motor to reduce inrush current. Soft starters work by controlling the voltage applied to the motor. VFDs and soft starters differ in their control methods and applications.

• Soft starters gradually increase voltage to the motor to reduce inrush current, protecting the motor and connected equipment.

• Soft starters work by controlling the voltage applied to the motor, while VFDs contro...read more

An ideal transformer is a theoretical transformer with no losses and perfect efficiency.

• An ideal transformer has no resistance, leakage inductance, or core losses.

• It has a turns ratio that perfectly converts voltage and current from primary to secondary windings.

• Efficiency is 100% in an ideal transformer.

• Real transformers have losses due to resistance, eddy currents, and hysteresis.

Maintenance of transformers involves regular inspection, testing, and servicing to ensure optimal performance and prevent breakdowns.

• Regularly inspect transformers for signs of wear and tear, such as overheating, leaks, and corrosion

• Perform routine testing to check for proper functioning of components, such as insulation resistance and oil quality

• Service transformers as needed, including cleaning, tightening connections, and replacing faulty parts

• Keep detailed records of main...read more

Electrical systems are used for powering various devices and equipment, providing lighting, heating, cooling, and communication.

• Electrical systems are essential for powering devices and equipment in homes, offices, factories, and other facilities.

• They provide lighting for indoor and outdoor spaces, ensuring visibility and safety.

• Electrical systems also enable heating and cooling systems to regulate temperature in buildings.

• Communication systems such as telephones, internet, a...read more

kVA is the apparent power, while kW is the real power. The relationship between them is determined by the power factor.

• kVA is the product of voltage and current in a circuit, while kW is the actual power consumed by the load.

• The relationship between kVA and kW is determined by the power factor of the load.

• Power factor = kW / kVA. A power factor of 1 indicates all power is being used efficiently.

• For example, if a load has a power factor of 0.8, it means it is using 80% of the ...read more

I have 3 years of experience working in an industrial setting, specifically in electrical maintenance.

• Experience troubleshooting and repairing electrical systems in an industrial environment

• Knowledge of industrial electrical codes and regulations

• Experience working with industrial machinery and equipment

• Ability to read and interpret electrical schematics and blueprints

• Experience with preventive maintenance practices in an industrial setting