Fuji Electric Interview Questions and Answers

Star and delta are two types of connections used in three-phase systems.

• Star connection has neutral point and is used for small loads.

• Delta connection has no neutral point and is used for high loads.

• Star connection has lower voltage and higher current while delta connection has higher voltage and lower current.

• Star connection is more reliable and easier to maintain than delta connection.

Power electronics devices are electronic components used to control and convert electrical power.

• Power electronics devices are used in various applications such as motor drives, renewable energy systems, and power supplies.

• Examples of power electronics devices include diodes, transistors, thyristors, and integrated circuits.

• These devices are used to control the flow of electrical power, convert AC to DC or DC to AC, and regulate voltage and current levels.

• Power electronics de...read more

Comparators are electronic circuits that compare two voltages and output a digital signal based on the comparison. Band pass filter circuit allows only a certain range of frequencies to pass through.

• Comparators are used in applications such as voltage level detection, waveform shaping, and pulse width modulation.

• They have two input terminals for the voltages to be compared and one output terminal for the digital signal.

• Band pass filter circuit consists of a combination of hig...read more

A rectifier is an electrical device that converts alternating current (AC) to direct current (DC). UPS stands for Uninterruptible Power Supply.

• Rectifier is used to convert AC to DC.

• Types of rectifiers include half-wave, full-wave, and bridge rectifiers.

• UPS is a device that provides backup power during power outages.

• The function of a UPS is to ensure uninterrupted power supply to connected devices.

• UPS uses a rectifier to convert AC power from the main supply to DC power for ch...read more

Time constant of an RC circuit is the time taken for the voltage across the capacitor to reach approximately 63.2% of its final value.

• Time constant (τ) is calculated as the product of resistance (R) and capacitance (C) in the circuit, τ = R * C.

• It represents the rate at which the capacitor charges or discharges in response to a step change in voltage.

• A smaller time constant indicates a faster response of the circuit, while a larger time constant indicates a slower response.

• Fo...read more

Motors convert electrical energy to mechanical energy, transformers transfer electrical energy between circuits, and UPS provides backup power.

• Motors operate on the principle of electromagnetic induction, converting electrical energy into mechanical energy.

• Example: An electric motor in a fan spins blades to create airflow.

• Transformers use electromagnetic induction to transfer electrical energy between circuits at different voltage levels.

• Example: Step-up transformers increase...read more

An inverter drive converts DC to AC power, controlling motor speed and torque for efficient operation.

• Inverter drives use power electronics to convert DC voltage from a source (like a battery) to AC voltage.

• They control the frequency and amplitude of the output voltage, allowing precise speed control of electric motors.

• Commonly used in applications like HVAC systems, conveyor belts, and electric vehicles.

• Inverter drives improve energy efficiency by matching motor speed to loa...read more

Quality tools are techniques used to monitor and improve the quality of products or processes.

• Statistical Process Control (SPC) - used to monitor and control processes

• Root Cause Analysis - used to identify and address the underlying cause of quality issues

• Failure Mode and Effects Analysis (FMEA) - used to identify potential failure modes and their effects

• Pareto Analysis - used to prioritize quality improvement efforts based on the most significant issues

• Control Charts - used ...read more