Calanjiyam Consultancies and Technologies 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

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

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

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