ANZ Banking Group Interview Questions and Answers

VFD output voltage increases after rectification due to the conversion process from AC to DC, typically around 1.4 times the input voltage.

• VFDs convert AC power to DC power through rectification

• The output voltage of a VFD is typically around 1.4 times the input voltage

• This increase in voltage is necessary for the VFD to effectively control the speed of the motor

Frequency of maintenance is decided based on equipment type, usage, manufacturer recommendations, and historical data.

• Consider the type of equipment being maintained

• Take into account the usage intensity of the equipment

• Refer to manufacturer recommendations for maintenance schedules

• Use historical data to identify patterns of wear and tear

• Factor in environmental conditions that may affect equipment performance

A hermetically sealed transformer is a transformer that is completely enclosed and sealed to prevent the entry of moisture, air, or other contaminants.

• Hermetically sealed transformers are commonly used in harsh environments where protection from moisture and contaminants is crucial.

• The sealing is typically done using a welded or brazed metal enclosure.

• These transformers are often filled with an insulating oil to provide cooling and insulation.

• Examples of applications include ...read more

Overheating of joints cables can be caused by high electrical resistance, overloading, poor connections, or insulation breakdown.

• High electrical resistance in joints can lead to overheating.

• Overloading the cables beyond their capacity can cause overheating.

• Poor connections or loose terminals can generate heat.

• Insulation breakdown can result in overheating of cables.

ISO 9001-2015 is a quality management system standard that helps organizations ensure they meet customer and regulatory requirements.

• ISO 9001-2015 sets out the criteria for a quality management system and is based on a number of quality management principles including a strong customer focus, the involvement of top management, and a process approach.

• It helps organizations improve their overall performance by focusing on customer satisfaction and continual improvement.

• ISO 9001...read more

Harmonics are voltage or current waveforms that are multiples of the fundamental frequency in an electrical system.

• Harmonics can cause issues such as overheating in electrical equipment, power quality problems, and interference with communication systems.

• Common sources of harmonics include non-linear loads like variable frequency drives, computers, and LED lighting.

• Harmonics can be mitigated using filters, transformers, and proper system design.

• Power factor correction can als...read more