Simfa Labs Electrical Maintenance Technician Interview Questions and Answers

The single line diagram of MSEB power supply shows the electrical connections and components in a simplified manner.

• It displays the power system from the point of view of a single line

• It shows the distribution of power from the source to the load

• It includes transformers, circuit breakers, switches, and other components

• It helps in understanding the flow of electricity and identifying potential issues

• Example: The single ...read more

Starters are devices used to start and control the speed of electric motors.

• Types of starters include direct-on-line, star-delta, soft starters, and variable frequency drives.

• Starters are needed to protect the motor from damage due to high starting currents.

• They also help to control the speed of the motor and improve its efficiency.

• The type of starter used depends on the motor's power rating and the application it is u

Different types of breakers with their ratings, applications, and working principles.

• Circuit Breaker: Used in electrical power systems to protect circuits from overloads and short circuits.

• Molded Case Circuit Breaker (MCCB): Rated up to 1,000 amps, commonly used in residential and commercial applications.

• Miniature Circuit Breaker (MCB): Rated up to 125 amps, used in low-voltage electrical systems.

• Air Circuit Breaker (A...read more

3-phase power supply has 3 alternating currents while 1-phase has only 1.

• 3-phase power supply is more efficient for high-power applications

• 1-phase power supply is commonly used for household appliances

• 3-phase power supply requires 3 wires while 1-phase requires only 2 wires

• 3-phase power supply is more expensive to install than 1-phase

Earthing and grounding are terms used interchangeably, but they have different meanings. Earthing refers to the connection of a conductor to the earth, while grounding refers to the connection of a conductor to a ground.

• Earthing is used to protect people and equipment from electrical shock by providing a low-impedance path for fault current to flow to the earth.

• Grounding is used to protect equipment from electrical noi...read more