Electrical Engineer, Electrician Interview Questions and Answers

The first step is to immediately cut off the power supply to the electrical room.

• Locate the main power switch and turn it off

• Call the fire department

• Evacuate the area and close all doors behind you

• Use a fire extinguisher if it is safe to do so

• Do not use water to extinguish an electrical fire

ACB and VCB are both circuit breakers used in electrical systems, but ACB is used for low voltage while VCB is used for high voltage.

• ACB stands for Air Circuit Breaker while VCB stands for Vacuum Circuit Breaker

• ACB is used for low voltage systems while VCB is used for high voltage systems

• VCB is more efficient and requires less maintenance than ACB

• ACB is cheaper than VCB

• Examples of ACB include Schneider Electric's Masterpact and Siemens' Sentron

• Examples of VCB include ABB's VD...read more

IGBT stands for Insulated Gate Bipolar Transistor. It is used as a switch in power electronics applications.

• IGBT is a three-terminal power semiconductor device.

• It combines the advantages of MOSFET and BJT.

• IGBT is used in high power applications such as motor drives, power supplies, and renewable energy systems.

• It is used to switch high voltage and high current loads.

• IGBT is controlled by a gate signal which determines the on and off state of the device.

DG set is operated when there is no power supply.

• Check fuel level and add if necessary

• Check oil level and top up if required

• Check battery and ensure it is fully charged

• Start the DG set and switch over the load

• Monitor the DG set for any issues

Transformers are electrical devices that transfer energy from one circuit to another through electromagnetic induction.

• Transformers are used to increase or decrease voltage levels in electrical circuits.

• They consist of two coils of wire wrapped around a magnetic core.

• The coil that receives electrical energy is called the primary coil, while the coil that delivers energy is called the secondary coil.

• Transformers are used in power distribution systems, electronic devices, and m...read more