Centom Industries Interview Questions and Answers

Transformer high voltage test is conducted to ensure the insulation system can withstand the rated voltage without breakdown.

• Ensure the transformer is properly grounded before conducting the test.

• Apply the high voltage to the transformer windings and measure the insulation resistance.

• Monitor for any signs of breakdown such as sparking or abnormal noises.

• Perform the test at different voltage levels to ensure the insulat...read more

A tap changer is a device used to vary the turn ratio of a transformer to regulate the voltage output.

• Tap changers are commonly used in power transformers to adjust the voltage levels based on load requirements

• There are two main types of tap changers: on-load tap changers (OLTC) and off-circuit tap changers (OCTC)

• OLTCs allow for changing taps while the transformer is energized, while OCTCs require the transformer to be...read more

A tap changer is used in transformers to adjust the number of turns in the winding and regulate the voltage output.

• Allows for voltage regulation in transformers

• Helps to adjust the number of turns in the winding

• Ensures a consistent voltage output despite fluctuations in input voltage

• Commonly used in power distribution systems and electrical substations

Control wiring is the wiring used to connect and control electrical devices in a system.

• Control wiring is used to connect various electrical components such as switches, relays, and sensors in a system.

• It is used to transmit signals and commands to control the operation of different devices.

• Control wiring is typically low voltage and carries signals rather than power.

• It is essential for the proper functioning of automa...read more

There are several types of breakers used in electrical systems for different purposes.

• Circuit breakers - used to protect electrical circuits from overloads and short circuits

• Fuse - a type of breaker that contains a metal strip that melts when overloaded

• GFCI (Ground Fault Circuit Interrupter) - used to protect against electric shock in wet areas

• Arc Fault Circuit Interrupter (AFCI) - detects dangerous arcing in electrica...read more