Electrical Research & Development Association Electrical Supervisor Interview Questions and Answers

The losses in transformers include copper losses and iron losses.

• Copper losses occur due to the resistance of the transformer windings.

• Iron losses, also known as core losses, occur due to hysteresis and eddy currents in the transformer core.

• Copper losses can be reduced by using larger conductor sizes or improving the cooling system.

• Iron losses can be minimized by using high-quality magnetic materials and optimizing the...read more

There are several types of substations, including transmission, distribution, collector, and switching substations.

• Transmission substations are used to step up or down voltage for long-distance transmission.

• Distribution substations are used to distribute power to local areas.

• Collector substations are used to collect power from renewable energy sources.

• Switching substations are used to switch power between different tra...read more

There are two types of substations - indoor and outdoor substations.

• Indoor substations are located inside buildings or structures.

• Outdoor substations are located outside and are exposed to the elements.

• Indoor substations are typically smaller and require less maintenance.

• Outdoor substations are larger and require more maintenance due to exposure to weather conditions.

• Both types of substations play a crucial role in the

The motors used in fans are typically single-phase induction motors.

• Fans typically use single-phase induction motors.

• These motors are designed to operate on a single-phase AC power supply.

• They are commonly used in ceiling fans, table fans, and pedestal fans.

• The motor rotates the fan blades, creating airflow and cooling effect.

• Some fans may also use brushless DC motors for improved energy efficiency.