Executive Electrical Maintenance Interview Questions and Answers

An expansion tank in a transformer helps to compensate for changes in the volume of the insulating oil due to temperature variations.

• Compensates for changes in oil volume caused by temperature fluctuations

• Prevents damage to the transformer due to excessive pressure build-up

• Helps maintain a constant oil level in the transformer

• Allows for expansion and contraction of the oil without affecting the transformer's operation

VFD stands for Variable Frequency Drive, ACB stands for Air Circuit Breaker, and VCP stands for Vacuum Circuit Breaker. They are used in electrical systems for controlling and protecting equipment.

• VFD (Variable Frequency Drive) is used to control the speed of an AC motor by varying the frequency and voltage supplied to the motor.

• ACB (Air Circuit Breaker) is a type of circuit breaker that operates in the air as the arc extinguishing medium.

• VCP (Vacuum Circuit Breaker) is a typ...read more

A breather in a transformer helps to prevent moisture and dust from entering the transformer, thus maintaining the insulation properties and extending the lifespan of the transformer.

• Prevents moisture and dust from entering the transformer

• Helps maintain insulation properties

• Extends the lifespan of the transformer

Synchronizing diesel generators involves matching the speed and phase of multiple generators before connecting them to a common electrical bus.

• Synchronization ensures that the generators are running at the same speed and phase to prevent damage when connected together.

• This process involves adjusting the speed and phase of the generators using specialized equipment.

• Once synchronized, the generators can be connected in parallel to share the electrical load.

• Failure to synchroniz...read more