OCS Group Electrical Technician Electrician Interview Questions and Answers

An air circuit breaker is an electrical device that provides protection against overcurrents by using air as the medium to extinguish the arc.

• Air circuit breakers work on the principle of thermal and magnetic tripping.

• When an overcurrent flows through the circuit, the bimetallic strip in the breaker heats up and bends, causing the contacts to open.

• The arc generated during the opening of contacts is extinguished by the ...read more

Losses in transformer refer to the energy lost in the form of heat during the process of transforming voltage.

• There are two types of losses in transformers: copper losses and iron losses.

• Copper losses occur due to the resistance of the wire used in the transformer's windings.

• Iron losses occur due to the magnetic properties of the transformer's core material.

• Copper losses can be reduced by using thicker wire or increasi...read more

UPS system ensures uninterrupted power supply during power outages.

• UPS stands for Uninterruptible Power Supply.

• It provides backup power to critical equipment during power outages.

• UPS systems can be of different types such as online, offline, and line-interactive.

• UPS systems are commonly used in data centers, hospitals, and other critical facilities.

UPS provides backup power during power outages while stabilizer maintains a constant voltage output.

• UPS stands for Uninterruptible Power Supply and provides backup power during power outages.

• Stabilizer maintains a constant voltage output and protects electrical equipment from voltage fluctuations.

• UPS is used for critical equipment like servers, medical equipment, etc. while stabilizer is used for household appliances l

Preventive maintenance in electrical systems involves regular inspections, testing, and servicing to prevent equipment failures and ensure optimal performance.

• Regularly inspect electrical equipment for signs of wear, damage, or overheating.

• Perform routine testing and calibration of electrical systems to identify potential issues before they cause failures.

• Clean and lubricate electrical components to prevent dust buildu...read more